The INWELT TR Series is a family of air-cooled MIG/MAG welding guns designed for professional fabrication, production welding, equipment manufacturing and industrial aftermarket applications.
The current product range includes:
TR300 – 350A CO₂ / 200A mixed-gas MIG gun
TR400 – 400A CO₂ / 300A mixed-gas MIG gun
TR500 – 500A CO₂ / 400A mixed-gas MIG gun
All current TR Series models use air-cooled torch architectures with a 60% duty cycle.
The series covers welding-wire diameters from 0.8 mm to 2.4 mm and supports multiple torch necks, consumable configurations, cable assemblies and rear connectors.
| Model | Cooling | CO₂ Rating | Mixed-Gas Rating | Duty Cycle | Wire Size |
|---|---|---|---|---|---|
| TR300 | Air Cooled | 350A | 200A | 60% | 0.8–1.6 mm |
| TR400 | Air Cooled | 400A | 300A | 60% | 1.0–1.6 mm |
| TR500 | Air Cooled | 500A | 400A | 60% | 1.0–2.4 mm |
These are current INWELT product ratings.
Do not assume that similarly named MIG guns from different manufacturers use identical ratings, duty cycles, wire ranges or consumables.
The INWELT TR300 is the lower-current model in the current TR Series.
Its current specification includes:
350A with CO₂
200A with mixed shielding gas
60% duty cycle
0.8–1.6 mm welding wire
Air-cooled construction
45° and 60° neck options
Multiple rear-connector configurations
The TR300 is suitable for medium- to heavy-duty fabrication where a robust air-cooled torch is required.
Typical applications include:
General fabrication
Structural welding
Machinery manufacturing
Agricultural equipment
Railway maintenance
Industrial repair
The INWELT TR400 provides additional current capacity for higher-output MIG/MAG welding.
Current specifications include:
400A with CO₂
300A with mixed shielding gas
60% duty cycle
1.0–1.6 mm welding wire
Air-cooled construction
45° and 60° neck options
Multiple rear connectors
The TR400 is suited to industrial fabrication and production welding requiring more current capacity than the TR300.
Always confirm the required cable length before ordering because cable-length configurations should match the current INWELT BOM.
The TR500 is the highest-current model in the current INWELT TR Series.
Its current specification includes:
500A with CO₂
400A with mixed shielding gas
60% duty cycle
1.0–2.4 mm welding wire
Air-cooled construction
Heavy-duty contact-tip options
Multiple nozzle and diffuser configurations
Multiple power-pin options
The TR500 is designed for higher-current production welding and applications using larger-diameter welding wire.
Typical applications include:
Heavy machinery
Structural fabrication
Mining equipment
Construction equipment
Railway fabrication
Heavy industrial production
Correct MIG gun selection should be based on several parameters rather than model name alone.
Use the verified INWELT rating for the actual shielding gas.
TR300: up to 350A CO₂
TR400: up to 400A CO₂
TR500: up to 500A CO₂
The mixed-gas rating is lower for each current model.
Current supported wire ranges are:
TR300: 0.8–1.6 mm
TR400: 1.0–1.6 mm
TR500: 1.0–2.4 mm
The contact tip, liner and wire feeder must all match the selected welding wire.
The current TR300, TR400 and TR500 specifications use a 60% duty-cycle rating.
Actual thermal load also depends on welding current, shielding gas, arc-on time and ambient conditions.
TR300 is suitable for medium- to heavy-duty welding.
TR400 provides higher-current capability.
TR500 supports the highest current and largest wire sizes in the current TR category.
The TR Series supports replaceable swan-neck configurations.
Current product structures include:
45° neck
60° neck
Different neck angles can help improve torch access according to joint geometry and welding position.
For OEM projects, custom neck lengths or bend configurations can be evaluated when technically feasible.
Neck selection should also consider:
Welding current
Contact-tip system
Nozzle geometry
Operator access
Cable balance
Different welding machines and wire feeders use different rear-interface systems.
Current TR Series configurations can include:
Euro central connector
Miller-style connection
Lincoln-style connection
Tweco-style connection
The exact connector should be selected according to the welding machine and wire feeder.
A similar-looking power pin does not automatically confirm full compatibility.
Before ordering, verify:
Power-pin geometry
Trigger/control connection
Gas connection
Wire-feed interface
Liner position
Cable length
For replacement projects, provide photographs of the existing gun connection and wire feeder.
The INWELT TR Series uses common Tregaskiss-style MIG gun and consumable formats for replacement and aftermarket applications.
However, compatibility should be verified by technical configuration rather than brand name alone.
Check:
Gun amperage
Wire diameter
Neck angle
Contact-tip system
Gas diffuser
Nozzle
Liner
Cable length
Power pin
Trigger/control connection
INWELT TR Series products are independently manufactured replacement-format welding guns.
Third-party trademarks and model references should be used only to identify replacement or compatibility formats where applicable.
The contact tip transfers welding current to the electrode wire and guides the wire into the arc.
Depending on model, TR Series consumables can support wire sizes including:
0.8 mm
0.9 mm
1.0 mm
1.2 mm
1.4 mm
1.6 mm
2.0 mm
2.4 mm
TR500 configurations also include heavy-duty and heavy-duty tapered contact-tip options.
Select the contact tip according to:
Welding wire diameter
Wire material
Contact-tip thread
Torch model
Welding current
Diffuser / retaining-head system
Do not select a contact tip from wire diameter alone.
The current TR Series consumable system includes multiple nozzle geometries.
Depending on torch model, options can include:
Flush nozzles
Recessed nozzles
Stick-out nozzles
Copper nozzles
Brass nozzles
Different nozzle opening diameters
Nozzle selection affects:
Gas coverage
Electrode stick-out
Access to the joint
Spatter accumulation
Front-end heat exposure
Use the nozzle configuration appropriate for the welding procedure.
Gas diffusers distribute shielding gas around the electrode wire and weld pool.
TR Series configurations can include standard and heavy-duty diffuser / retaining-head systems.
The correct diffuser must match:
Contact-tip system
Nozzle
Torch neck
Welding current
Inspect the diffuser for:
Spatter buildup
Damaged threads
Blocked gas holes
Heat damage
Replace damaged components rather than modifying gas passages.
The liner guides welding wire through the MIG gun cable.
Correct liner selection is important for stable wire feeding.
Depending on torch and wire configuration, liners are available for several wire-size ranges.
Consider:
Wire diameter
Wire material
Cable length
Wire-feeder configuration
A worn, contaminated or incorrectly sized liner can contribute to:
Irregular wire feeding
Bird-nesting
Increased feeding resistance
Arc instability
Premature contact-tip wear
TR Series models should not automatically use the same complete front-end configuration.
| Model | Wire Range | Typical Consumable Focus |
|---|---|---|
| TR300 | 0.8–1.6 mm | Standard industrial MIG consumables |
| TR400 | 1.0–1.6 mm | Higher-current contact tips and nozzles |
| TR500 | 1.0–2.4 mm | Heavy-duty tips, diffusers and larger-wire liners |
Always verify the individual torch BOM and consumable reference before ordering spare parts.
MIG gun ratings can differ according to shielding gas.
The current INWELT TR Series ratings are:
| Model | CO₂ | Mixed Gas |
|---|---|---|
| TR300 | 350A | 200A |
| TR400 | 400A | 300A |
| TR500 | 500A | 400A |
Do not use the CO₂ rating as the mixed-gas rating.
Shielding-gas composition affects torch thermal loading and must be considered when selecting the correct gun.
When configured with the appropriate wire, liner, contact tip, shielding gas and welding parameters, the TR Series can support MIG/MAG welding of materials such as:
Carbon steel
Mild steel
Stainless steel
The MIG gun alone does not determine material compatibility.
The complete welding process must also match the base material.
The TR Series is designed for professional and industrial welding applications including:
Construction machinery
Agricultural equipment
Structural steel fabrication
Truck and trailer manufacturing
Railway equipment
Heavy machinery
General engineering
Industrial maintenance
Production fabrication
The correct model should be selected according to welding current, shielding gas, wire diameter and production duty.
There is no universal replacement interval for MIG gun consumables.
Service life depends on:
Welding current
Duty cycle
Wire diameter
Wire material
Shielding gas
Spatter level
Contact-tip quality
Liner condition
Welding position
Operator technique
Inspect consumables when symptoms appear, including:
Unstable arc
Burn-back
Irregular wire feeding
Excessive spatter
Poor gas coverage
Damaged nozzle
Increased electrical resistance
Replace worn components based on condition rather than a fixed number of welding hours.
Check:
Liner condition
Contact-tip size
Drive-roll pressure
Cable bends
Wire quality
Check:
Welding parameters
Shielding gas
Nozzle condition
Contact-tip wear
Stick-out
Possible causes include:
Welding above the verified rating
Exceeding duty cycle
Poor electrical connection
Worn contact tip
Damaged cable assembly
Excessive arc-on time
Check:
Nozzle blockage
Diffuser condition
Gas flow
Gas leakage
Wind or drafts
Troubleshooting should always consider the complete welding system.
The TR Series is suitable for distributors that require both complete MIG guns and repeat aftermarket consumables.
A professional product program can include:
TR300 complete guns
TR400 complete guns
TR500 complete guns
Contact tips
Gas nozzles
Gas diffusers
Retaining heads
Neck insulators
Swan necks
Liners
Cable assemblies
Rear connectors
Power pins
Trigger components
Publishing exact part-number mapping helps distributors reduce replacement errors and manage inventory more accurately.
INWELT supplies TR Series MIG/MAG welding guns and replacement parts to professional B2B customers including:
Welding machine manufacturers
Welding equipment brands
Importers
Distributors
Wholesalers
Industrial suppliers
Repair companies
Aftermarket consumable brands
OEM and ODM configurations can be evaluated according to the target welding machine and market requirements.
Customization may include:
Customer branding
Product labels
Handle marking
Neck angle
Neck length
Cable length
Power pin
Euro connector
Miller-style connector
Lincoln-style connector
Tweco-style connector
Consumable kits
Private-label packaging
Barcodes
Carton requirements
For OEM projects, provide the welding machine model, wire feeder, required current, shielding gas, wire diameter, connector and estimated purchasing quantity.
The INWELT TR Series combines three heavy-duty air-cooled current classes with a broad replacement-consumable and connector program.
The current category includes:
350A CO₂ TR300
400A CO₂ TR400
500A CO₂ TR500
60% duty-cycle models
Wire sizes from 0.8 mm to 2.4 mm
45° and 60° neck options
Multiple nozzle geometries
Standard and heavy-duty contact tips
Gas diffusers and retaining heads
Welding liners
Euro, Miller-style, Lincoln-style and Tweco-style connections
OEM and private-label options
For equipment manufacturers, distributors and importers, sourcing complete guns and replacement parts from one supplier can simplify purchasing and aftermarket support.
The current range includes:
TR300
TR400
TR500
The current TR300, TR400 and TR500 models are air cooled.
The current INWELT TR300 specification is:
350A CO₂
200A mixed gas
60% duty cycle
The current INWELT TR400 specification is:
400A CO₂
300A mixed gas
60% duty cycle
The current INWELT TR500 specification is:
500A CO₂
400A mixed gas
60% duty cycle
The TR500 supports welding wire up to approximately 2.4 mm in the current INWELT configuration.
Current TR Series configurations include 45° and 60° swan-neck options.
Depending on model and configuration, options include:
Euro central connector
Miller-style connector
Lincoln-style connector
Tweco-style connector
No.
Contact-tip, diffuser, nozzle, retaining-head, neck and liner configurations must be matched to the specific gun setup.
Yes, when configured with the correct welding wire, shielding gas, liner, contact tip and welding parameters.
No.
TR Series is an INWELT-manufactured MIG/MAG welding-gun range. References to Tregaskiss-style formats or third-party trademarks are used only to describe replacement or compatibility formats where applicable.
Not necessarily.
Current ratings, wire ranges, cable assemblies and consumable configurations may differ.
Use INWELT technical specifications and confirmed compatibility information when selecting an INWELT TR Series gun.
Yes.
OEM/ODM, private labeling, connector, neck, cable and consumable-kit customization can be evaluated for qualified B2B customers.
For faster model selection and compatibility confirmation, provide:
Welding machine manufacturer and model
Wire-feeder model
Required welding current
CO₂ or mixed-gas application
Welding wire diameter
Existing MIG gun model
Rear connector / power-pin photo
Required neck angle
Required cable length
Required consumables
Estimated purchasing quantity
INWELT or private-label branding
INWELT can then recommend the appropriate TR300, TR400 or TR500 configuration for your welding system.
