Gas Cooled LB250 MIG Welding Torch Spool Gun

LB250 MIG Spool Gun Overview

The INWELT LB250 MIG Spool Gun is a gas-cooled welding gun featuring an integrated wire-spool holder and gun-mounted wire-feeding assembly. It is designed for compatible MIG/MAG welding applications, particularly those requiring more controlled feeding of aluminum and other welding wires that can be difficult to feed through a conventional long torch liner.

The LB250 is rated at 200A with CO₂ shielding gas and 180A with mixed shielding gas at a 60% duty cycle. It supports welding wire diameters from Ø0.8 mm to Ø1.2 mm and is available with 3 m, 4 m, 6 m and 8 m cable assemblies.

Unlike a conventional MIG welding torch that receives wire through a long cable liner from a remote wire feeder, a spool gun carries a small wire spool close to the welding gun. Its local feeding mechanism delivers wire through a shorter feed path near the torch head.

This configuration can help reduce wire-feeding resistance and the risk of wire buckling when the equipment is properly set up.

INWELT supplies the LB250 MIG spool gun and matching replacement components for welding equipment distributors, OEM brands, importers and industrial buyers.

LB250 MIG Spool Gun Technical Specifications

The following specifications are based on the standard INWELT LB250 product listing.

Important: The published electrical ratings refer to the specified CO₂ and mixed-gas operating conditions. For aluminum MIG welding with argon-based shielding gas, the allowable current and duty cycle should be confirmed for the intended application.

The welding gun model number does not establish an automatic 250A continuous or rated output.

How Does the LB250 MIG Spool Gun Work?

A MIG spool gun places the welding wire supply close to the torch feeding mechanism.

During operation, the gun-mounted feeding assembly draws welding wire from the installed spool and delivers it through the short internal wire path to the contact tip.

The welding current is transferred through the contact tip to the continuously fed electrode wire, while shielding gas is directed toward the weld area through the gas nozzle.

Integrated Wire Spool and Gun-Mounted Feeding

The LB250 features a spool holder mounted on the welding gun body.

The spool is positioned near the feeding mechanism rather than at a distant wire feeder.

This arrangement reduces the length of wire that must be pushed through a liner before reaching the contact tip.

It can be especially useful when feeding relatively soft welding wires, including aluminum wire, provided that the drive roll, contact tip, shielding gas and welding parameters are correctly selected.

Spool Gun vs. Push-Pull MIG Gun

Although both systems can improve welding wire delivery, a spool gun and a push-pull MIG gun use different feeding arrangements.

The INWELT LB250 should be identified as a MIG spool gun based on its integrated spool-holder configuration. Push-pull functionality should only be specified when the complete drive system has been technically verified.

Key Features of the INWELT LB250

200A CO₂ and 180A Mixed-Gas Ratings

The LB250 has the following published ratings:

• 200A with CO₂ shielding gas

• 180A with mixed shielding gas

• 60% duty cycle

Duty cycle describes the permitted arc-on time at the rated current under specified test conditions.

At a 60% duty cycle, the standard reference is six minutes of welding during a ten-minute operating period at the applicable rated load.

The correct operating current must be selected according to the shielding gas, welding procedure and thermal requirements.

Ø0.8–1.2 mm Welding Wire Range

The LB250 supports Ø0.8–1.2 mm welding wire.

This stated range describes the torch's supported wire diameters. The drive roll, contact tip and other feeding components must be configured for the specific wire material and diameter.

For aluminum welding, confirm the correct feeding components for the selected aluminum wire.

For steel or stainless steel welding, verify the drive system and shielding-gas requirements before use.

3 m, 4 m, 6 m and 8 m Cable Options

The LB250 is available with four cable lengths:

• 3 m

• 4 m

• 6 m

• 8 m

Cable length should be selected according to the workstation layout, reach requirements and compatible welding equipment.

Because the spool gun carries its wire supply near the torch, its wire-feeding arrangement differs from that of a conventional MIG torch supplied from a remote feeder.

However, longer cable assemblies still require correct electrical connections, trigger wiring and cable management.

Integrated Spool Holder

The LB250 includes a gun-mounted spool assembly, allowing welding wire to be supplied directly from the spool installed on the gun.

The correct spool dimensions, mounting arrangement and permissible spool weight should be confirmed before ordering replacement wire spools.

Replaceable Front-End Components

The LB250 uses replaceable front-end MIG welding consumables, including a gas nozzle, contact tip and gas diffuser.

The standard parts list identifies a 25AK-type front-end configuration.

For maintenance and repeat purchasing, replacement parts should be selected by verified size, thread and product reference.

LB250 Spool Gun for Aluminum Welding

The LB250 is intended for applications that include compatible aluminum MIG welding.

Aluminum welding wire is generally softer and more susceptible to feeding problems than conventional solid steel welding wire.

A spool gun reduces the distance between the wire spool and the welding gun's feeding mechanism, making it a useful configuration for some aluminum MIG welding applications.

Why Use a Spool Gun for Aluminum?

A spool gun can help address several common wire-feeding challenges:

• Wire buckling inside a long liner

• Excessive feed resistance

• Inconsistent wire delivery

• Wire deformation caused by unsuitable drive-roll pressure

• Feeding difficulties associated with soft aluminum wire

The result still depends on the complete welding system, correct wire selection and appropriate setup.

Choosing Aluminum Welding Wire

Common aluminum MIG filler wire families include ER4043 and ER5356.

The appropriate filler metal should be selected according to the base material, required mechanical properties and qualified welding procedure.

Before using a particular aluminum wire with the LB250, verify:

• Wire diameter

• Drive-roll groove and size

• Contact-tip specification

• Spool dimensions

• Feed mechanism compatibility

• Shielding gas

• Welding power source settings

Shielding Gas for Aluminum MIG Welding

Aluminum MIG welding commonly uses argon-based shielding gas, with the specific gas selected according to the welding procedure.

CO₂ shielding gas should not be treated as the standard shielding gas for aluminum MIG welding.

The LB250's published CO₂ and mixed-gas current ratings must not be interpreted as a separately verified current rating for every argon-based aluminum welding procedure.

Confirm the permitted operating conditions for the selected shielding gas and application.

LB250 Wire Spool, Drive Roll and Liner Selection

Correct wire-feeding configuration is essential to spool gun performance.

Wire Spool Compatibility

Before purchasing welding wire for the LB250, confirm the spool diameter, hub dimensions and mounting requirements.

Spool size and capacity should be verified against the actual LB250 reel assembly.

Do not assume that any small MIG welding wire spool will fit the gun.

Drive Roll Selection

The drive roll must match the welding wire diameter and material.

For soft aluminum wire, an appropriate groove design and feed pressure help reduce wire deformation.

For other welding wires, a different drive-roll configuration may be required.

Excessive drive pressure can deform soft wire, while insufficient pressure may cause slippage.

Contact Tip Selection

The contact tip must correspond to the welding wire diameter and front-end configuration.

The LB250 standard parts list includes an Ø1.0 mm E-Cu contact tip with M6 × 28 dimensions.

For Ø0.8 mm or Ø1.2 mm wire, confirm the corresponding contact-tip size and bore specification.

Liner Selection

The LB250 spare parts list includes a short liner identified as 4.0 × 2.0 × 200 mm.

Replacement liner dimensions and material should match the corresponding feeding arrangement.

The correct liner should be selected based on the actual torch assembly rather than the cable length alone.

Specification

LB250 Spool Gun Cable Lengths and Ordering Codes

INWELT provides complete LB250 welding gun assemblies in several standard lengths.

The listed configurations are described as integrated four-wire control assemblies.

For OEM or replacement orders, confirm the cable assembly, electrical connector and control-wire configuration before production.

Choosing the Right Cable Length

3 m LB250 Spool Gun

An option for compact workstations where the welding machine is positioned close to the welding area.

4 m LB250 Spool Gun

Provides additional reach for fabrication benches and general workshop applications.

6 m LB250 Spool Gun

Can be considered where the welding operator requires greater movement around larger workpieces.

8 m LB250 Spool Gun

Provides extended working reach, subject to suitable welding equipment, electrical connections and cable management.

LB250 MIG Spool Gun Consumables and Replacement Parts

INWELT provides a component reference list for the LB250 spool gun assembly.

LB250 Spare Parts Reference Table

The original component descriptions may include shared parts used across several torch families. These references do not imply that the LB250 is water-cooled or universally compatible with other torch models.

25AK Gas Nozzle and Contact Tip

The LB250 includes a standard Φ15 mm 25AK-type gas nozzle.

The contact tip is specified as an Ø1.0 mm E-Cu part with an M6 × 28 configuration.

These components work together to direct shielding gas and transfer welding current to the wire.

For bulk replacement orders, confirm the dimensions and component references.

Spool Assembly, Trigger and Torch Head

The gun-mounted spool assembly supports the welding wire supply.

The trigger provides the operator control input for the connected welding system.

The torch head supports the front-end welding components.

These parts should be matched to the specified LB250 assembly when ordering replacements.

Cable, Connector and Control Wires

The LB250 includes a control-wire system associated with the gun-mounted wire feeder.

The current parts list includes a four-core control cable and a Euro central adapter body.

However, the actual power-source compatibility depends on the complete connector, control wiring and spool-gun motor requirements.

LB250 MIG Spool Gun Compatibility Guide

The LB250 should only be connected to a welding power source and control system suitable for the selected spool-gun assembly.

An ordinary MIG welding machine with a Euro connector is not necessarily spool-gun compatible.

What Should Buyers Verify?

Is the LB250 Compatible with Every Euro-Connector MIG Welder?

No.

The appearance of a Euro connector is not sufficient evidence of complete spool-gun compatibility.

The power source must support the required electrical, mechanical and wire-feeder control functions.

For replacement or OEM projects, buyers should provide the welding machine model, connector drawings and control requirements.

How to Set Up an LB250 MIG Spool Gun

The following general procedure should be used together with the instructions for the particular welding machine and LB250 configuration.

Step 1: Confirm Equipment Compatibility

Verify the welding power source, connector and spool-gun control requirements.

Do not connect unverified control wiring to the welding equipment.

Step 2: Disconnect the Welding Equipment

Turn off and isolate the power source before installing or changing the spool gun and its components.

Step 3: Install the Correct Welding Wire Spool

Use a spool with verified dimensions and a suitable welding wire type.

Follow the manufacturer's spool mounting instructions.

Step 4: Check the Drive Roll

Confirm that the drive-roll groove and size match the welding wire.

Set the drive-roll pressure according to the applicable equipment instructions.

Step 5: Install the Correct Contact Tip

Select the contact tip according to wire diameter and front-end specifications.

Step 6: Connect the Welding Gun

Connect the power, gas and control interfaces according to the verified equipment configuration.

Step 7: Set the Shielding Gas and Welding Parameters

Select shielding gas and welding parameters suitable for the wire and material.

For aluminum welding, use a qualified argon-based gas configuration as required by the procedure.

Step 8: Verify Wire Feeding

Perform the equipment manufacturer's wire-feed check and verify that the wire moves smoothly.

After confirming safe operation, make a test weld and adjust the welding parameters according to the application.

LB150 vs. LB250 MIG Spool Gun

INWELT supplies both LB150 and LB250 models in its Spool Gun series.

When Should You Choose LB150?

Consider LB150 where the required welding current and wire diameter fall within the LB150 operating range.

When Should You Choose LB250?

Consider LB250 where a higher published current rating or a wire diameter up to Ø1.2 mm is required.

The selection should also account for shielding gas, welding process, spool dimensions and equipment compatibility.

Industrial Applications of the LB250 Spool Gun

The LB250 can be considered for compatible MIG welding applications where a gun-mounted wire-feeding system is beneficial.

Aluminum Fabrication

The LB250 can be used for suitable aluminum fabrication operations when the required wire, shielding gas and welding parameters are correctly selected.

Automotive Aluminum Repair

A spool gun can be useful in automotive repair applications involving suitable aluminum components.

Welding procedures and material specifications must be followed, especially for safety-critical components.

Marine Aluminum Fabrication

For compatible aluminum fabrication and repair operations in marine environments, the LB250 can be evaluated according to the welding procedure and equipment requirements.

General Metal Fabrication

The LB250 can be used with suitable welding wires for general metal fabrication, subject to the correct feeding and welding configuration.

Industrial Maintenance

The spool-gun configuration can be considered for maintenance and repair operations where wire feeding and workpiece accessibility are important.

Common LB250 Spool Gun Problems and Solutions

Why Does an LB250 Spool Gun Jam Welding Wire?

Wire jams may result from unsuitable drive-roll tension, spool drag, a damaged contact tip or misalignment in the wire path.

For aluminum wire, the feeding components must be suitable for the selected soft wire.

Why Does the LB250 Spool Gun Feed Wire Irregularly?

Irregular feeding may be caused by drive-roll slippage, excessive spool resistance, an incorrect contact tip or an electrical control problem.

Check the mechanical feeding components before replacing the complete welding gun.

Why Does the LB250 Spool Gun Overheat?

Excessive heating can occur when the welding current or operating duty cycle exceeds the specified conditions.

Poor electrical connections or damaged cable components may also contribute to overheating.

Stop welding and allow the equipment to cool before inspection.

LB250 Spool Gun Maintenance

Regular inspection can help maintain the feeding system and front-end components.

Inspect the Spool Holder

Check for damage, contamination or mechanical interference that could affect spool movement.

Inspect the Drive Roll

Remove accumulated wire debris and inspect the groove for wear or damage.

Check the Contact Tip

Replace the contact tip if wear or damage affects wire feeding or current transfer.

Clean the Gas Nozzle

Remove spatter buildup and inspect the nozzle for deformation.

Inspect the Cable and Control Wires

Check the cable jacket, electrical connectors and control wiring for damage.

Follow the Correct Maintenance Procedure

Use the maintenance instructions applicable to the specific LB250 assembly.

Do not apply lubricants to the drive system or wire path unless permitted by the manufacturer.

Disconnect the welding equipment before performing maintenance.

OEM and Wholesale LB250 MIG Spool Gun Supply

INWELT supplies LB250 MIG spool guns and related components for international B2B purchasing.

Typical customers include:

• Welding equipment distributors

• Welding equipment importers

• Industrial welding suppliers

• OEM welding equipment brands

• Wholesale welding product companies

• Industrial fabrication businesses

• Welding equipment service providers

Standard LB250 Wholesale Supply

Standard purchasing options include:

• LB250 complete spool guns

• 3 m, 4 m, 6 m and 8 m cable lengths

• Matching front-end consumables

• Replacement torch components

• Bulk and wholesale purchasing

• Distributor packaging requirements

OEM and Private-Label Spool Guns

INWELT supports OEM/ODM inquiries for spool-gun supply projects.

Technical and commercial requirements may include:

• Cable assembly configuration

• Connector requirements

• Product marking

• Private-label packaging

• Replacement-parts supply

• Order-specific documentation

• Packaging quantities

• Sample approval before bulk production

For nonstandard configurations, customers should provide relevant drawings, connector specifications or reference samples.

LB250 Spare Parts for Distributors

The availability of model-specific consumables and mechanical components helps distributors organize replacement stock.

Customers can include contact tips, gas nozzles, diffusers and other confirmed LB250 components in their purchasing plans.

Using verified part numbers reduces the risk of incorrect replacement orders.

Frequently Asked Questions About LB250 Spool Guns

What is the INWELT LB250 MIG spool gun?

The LB250 is a gas-cooled MIG welding spool gun with an integrated wire-spool holder and gun-mounted feeding system. It supports Ø0.8–1.2 mm welding wire and is available with 3 m, 4 m, 6 m and 8 m cables.

Is the LB250 a 250A spool gun?

LB250 is the model designation. The current INWELT product specification lists 200A with CO₂ and 180A with mixed shielding gas at a 60% duty cycle. Any other rating must be separately confirmed.

Can the LB250 spool gun weld aluminum?

The LB250 is designed for compatible aluminum MIG welding applications. The correct wire, drive roll, contact tip, shielding gas and power-source configuration must be selected.

What welding wire sizes does the LB250 support?

The published wire diameter range is Ø0.8–1.2 mm.

What shielding gas should I use for aluminum MIG welding?

Aluminum MIG welding commonly uses argon-based shielding gas. The exact gas and operating parameters depend on the welding procedure and base material.

Does the LB250 have a built-in wire spool?

The LB250 includes a gun-mounted wire-spool holder and feeding arrangement. The spool dimensions and capacity should be confirmed before purchasing replacement wire spools.

Is the LB250 a push-pull MIG welding gun?

The LB250 is identified as a spool gun with a wire spool mounted on the welding gun. It should not be described as a conventional remote-spool push-pull system without verification of its complete drive arrangement.

What cable lengths are available for the LB250?

INWELT offers 3 m, 4 m, 6 m and 8 m cable assemblies.

What contact tip does the LB250 use?

The standard parts list includes an Ø1.0 mm E-Cu contact tip with M6 × 28 dimensions, product code IJDV0015-10.

What gas nozzle does the LB250 use?

The standard parts list specifies a Φ15 mm 25AK-type gas nozzle, product code IJDT0089.

Is the LB250 compatible with every MIG welding machine?

No. Compatibility depends on the welding power source, connector, control wiring, spool-gun motor and gas connection requirements.

Can the LB250 weld stainless steel?

The LB250 is listed for stainless steel welding applications. The wire-feeding components, shielding gas and welding parameters must be suitable for the particular wire and material.

What is the difference between LB150 and LB250?

The LB150 is rated at 150A CO₂ and 130A mixed gas at a 60% duty cycle, while the LB250 is rated at 200A CO₂ and 180A mixed gas at the same duty cycle. The LB250 also supports a larger maximum listed wire diameter.

Does INWELT supply LB250 replacement parts?

Yes. INWELT lists replacement components including contact tips, gas nozzles, diffusers, torch heads, triggers, reel assemblies, connectors and liners.

Can INWELT manufacture OEM LB250 spool guns?

INWELT supports OEM/ODM inquiries for LB250 spool guns, including connector requirements, cable configurations, product labeling and packaging.

Can distributors purchase LB250 spool guns in bulk?

Yes. INWELT supplies LB250 spool guns and replacement components for wholesale, OEM and industrial purchasing projects.

Request an LB250 MIG Spool Gun Quote

Looking for an LB250 MIG spool gun manufacturer or wholesale supplier for aluminum welding equipment?

INWELT supplies LB250 welding spool guns, matching replacement components and OEM/ODM options for distributors, importers and industrial buyers.

For an accurate quotation, please provide:

• Required model: LB250

• Welding power source and wire feeder model

• Connector and control-wire requirements

• Welding wire material and diameter

• Required spool size

• Cable length: 3 m / 4 m / 6 m / 8 m

• Required consumables or spare parts

• Purchase quantity

• OEM/ODM requirements

• Destination market

Contact INWELT for LB250 MIG Spool Gun Specifications, Bulk Pricing, Replacement Parts and OEM/ODM Supply.