The INWELT BND Series is a family of air-cooled MIG/MAG welding guns designed for professional fabrication, manufacturing, maintenance and industrial aftermarket applications.
The current product range includes:
BND300 – 300A-class air-cooled MIG welding gun
BND400 – higher-current air-cooled MIG welding gun
Both current models use a 60% duty-cycle configuration and are available with 3.6 m and 4.6 m cable lengths.
The BND Series is designed around common Bernard-style torch and consumable formats while using INWELT's own verified technical specifications.
| Model | Cooling | Current Class | Duty Cycle | Wire Size | Cable Length |
|---|---|---|---|---|---|
| BND300 | Air Cooled | 300A | 60% | 0.6–1.6 mm | 3.6 / 4.6 m |
| BND400 | Air Cooled | Verify final INWELT rating | 60% | 0.9–1.6 mm | 3.6 / 4.6 m |
The BND300 is currently verified by INWELT as a 300A air-cooled MIG welding gun.
Before publishing a definitive amperage figure for BND400 at category level, confirm the final INWELT engineering or BOM rating and use the same value consistently across the product page, category page and technical data.
The INWELT BND300 is a Bernard-style manual MIG/MAG welding gun designed for professional fabrication and repair applications.
Current INWELT specifications include:
Up to 300A rated current
60% duty cycle
Air-cooled construction
0.6–1.6 mm welding-wire range
3.6 m / 4.6 m cable options
Curved ergonomic handle
Flexible welding cable
Forged brass neck
Replaceable front-end consumables
The BND300 is suitable for applications requiring a balance of current capacity, operator maneuverability and serviceable consumables.
Typical applications include:
General fabrication
Structural welding
Machinery manufacturing
Equipment repair
Agricultural equipment
Automotive fabrication
Industrial maintenance
The BND400 is the higher-current model in the current INWELT BND Series.
Current verified product information includes:
Air-cooled construction
60% duty cycle
0.9–1.6 mm welding-wire range
3.6 m / 4.6 m cable options
Bernard-style torch architecture
Flexible cable assembly
Replaceable front-end consumables
Before publishing a fixed current value in this section, INWELT should confirm the final BND400 amperage rating from the current engineering specification or BOM.
Once verified, the current rating should be used consistently in:
Product title
Category comparison table
Technical specification
Product structured data
Catalog
Product images
Distributor documentation
The correct BND welding gun should be selected according to the complete welding application rather than model name alone.
Use BND300 for applications within its verified 300A-class rating.
Choose BND400 when a higher-current torch configuration is required, after confirming the final INWELT BND400 rated output.
Do not continuously operate a MIG gun above its verified current rating.
Current INWELT wire ranges are:
BND300 – 0.6–1.6 mm
BND400 – 0.9–1.6 mm
The contact tip, liner and drive rolls must match the actual welding wire.
Both current BND models are listed with a 60% duty cycle.
Actual thermal load also depends on:
Welding current
Shielding gas
Arc-on time
Wire diameter
Ambient temperature
Cable condition
Electrical connections
Duty cycle should always be considered together with rated current.
Current BND Series cable options include:
3.6 m
4.6 m
A shorter cable can provide easier handling in compact workstations.
A longer cable provides additional working reach but requires correct liner installation and wire-feed setup.
The INWELT BND Series is designed around common Bernard-style MIG gun and consumable formats for professional replacement and aftermarket applications.
However, compatibility should be confirmed by technical configuration rather than model name or appearance alone.
Before ordering, verify:
Rated current
Duty cycle
Welding-wire diameter
Contact-tip system
Gas diffuser
Gas nozzle
Liner
Neck configuration
Cable length
Rear connector / power pin
Trigger and control connection
A similar torch shape does not automatically guarantee complete compatibility.
The front-end consumable system plays an important role in wire feeding, electrical current transfer and shielding-gas delivery.
Depending on the BND configuration, service parts can include:
Contact tips
Gas nozzles
Gas diffusers
Retaining components
Liners
Neck insulators
Torch necks
Handles
Triggers
Cable assemblies
Rear connectors / power pins
Always select consumables according to the exact torch configuration and part number.
The contact tip transfers welding current to the electrode wire while guiding the wire into the welding arc.
Select the correct contact tip according to:
Welding-wire diameter
Wire material
Torch model
Tip geometry
Gas diffuser
Welding current
An incorrectly sized or worn contact tip can contribute to:
Irregular arc behavior
Burn-back
Increased electrical resistance
Poor wire guidance
Excessive spatter
Do not select contact tips by wire diameter alone.
The gas nozzle directs shielding gas around the electrode wire and weld pool.
Correct nozzle selection depends on:
Torch model
Diffuser system
Joint access
Electrode stick-out
Shielding-gas requirement
Inspect the nozzle regularly for:
Spatter buildup
Heat damage
Distortion
Blocked gas passages
Loose installation
Clean or replace the nozzle according to actual condition rather than a fixed service interval.
The gas diffuser supports the contact-tip system and distributes shielding gas through the torch front end.
Correct diffuser selection helps maintain:
Contact-tip positioning
Gas distribution
Stable shielding
Reliable front-end assembly
Do not mix diffuser and contact-tip systems unless the complete combination has been verified.
The liner guides welding wire through the cable assembly from the feeder toward the contact tip.
Correct liner installation is essential for stable wire feeding.
Select the liner according to:
Wire diameter
Wire material
Cable length
Power-pin configuration
Torch model
A liner that is too short, too long, contaminated or incorrectly sized can contribute to:
Bird-nesting
Irregular wire feeding
Increased feeding resistance
Premature contact-tip wear
Arc instability
The liner should extend correctly through the gun and terminate at the specified position for the selected front-end and rear-connector system.
When servicing a BND Series gun:
Straighten the torch cable.
Remove the front-end consumables as required.
Remove the worn liner.
Install the replacement liner without kinking.
Trim the liner to the verified specification.
Remove burrs that could obstruct the welding wire.
Reassemble the correct diffuser, contact tip and nozzle.
Always follow the confirmed INWELT liner specification for the actual BND configuration.
Bernard-style industrial MIG guns commonly use fixed or rotatable neck designs to improve access to different weld joints.
For INWELT BND configurations, verify the exact neck supplied with the selected complete gun.
A rotatable neck can be useful for:
Internal corners
Frames
Tubular assemblies
Machinery
Automotive components
Restricted-access welds
Do not assume that every neck from another Bernard-style system is directly interchangeable.
Confirm thread, front-end system and mechanical dimensions.
The rear connector or power pin connects the MIG gun to the welding machine or wire feeder.
Different welding systems can use different power-pin arrangements.
Before selecting a BND replacement gun, confirm:
Power-pin type
Trigger wiring
Gas connection
Liner retention
Wire-guide position
Feeder interface
For replacement orders, provide photographs of the existing gun connector and wire-feeder socket.
This is more reliable than selecting a torch by amperage alone.
Professional Bernard-type MIG gun platforms can use different consumable architectures.
These may include different combinations of:
Contact tips
Diffusers
Nozzles
Liners
Neck insulators
Power pins
A component that physically fits one system should not automatically be considered compatible with another system.
For INWELT BND products, use the verified part-number relationship for the complete torch configuration.
The primary differences between current BND models are intended current class and wire-size range.
| Feature | BND300 | BND400 |
|---|---|---|
| Cooling | Air Cooled | Air Cooled |
| Duty Cycle | 60% | 60% |
| Rated Current | Up to 300A | Verify final INWELT rating |
| Wire Size | 0.6–1.6 mm | 0.9–1.6 mm |
| Cable Length | 3.6 / 4.6 m | 3.6 / 4.6 m |
| Main Positioning | Professional fabrication | Higher-current fabrication |
Select the final model according to welding current, wire diameter, cable length and welding-machine interface.
When configured with the correct wire, liner, contact tip, shielding gas and welding parameters, BND Series MIG/MAG guns can support welding of materials such as:
Carbon steel
Mild steel
Stainless steel
Aluminum welding requires additional attention to wire feeding because aluminum wire is relatively soft.
An aluminum welding setup may require:
Suitable liner material
Correct contact-tip clearance
Appropriate drive rolls
Correct wire-feed path
Compatible shielding gas
The torch alone does not determine material compatibility.
Depending on the selected configuration, BND Series welding guns can be used in applications including:
Structural fabrication
Heavy equipment
Agricultural machinery
Automotive fabrication
Trailer manufacturing
Machinery production
General metal fabrication
Industrial repair
Maintenance operations
Choose the torch according to actual current, duty cycle, wire size and feeder interface rather than industry name alone.
There is no universal replacement interval for MIG gun consumables.
Service life depends on:
Welding current
Duty cycle
Welding-wire diameter
Wire quality
Shielding gas
Spatter level
Liner condition
Contact-tip quality
Welding position
Operator technique
Inspect the consumables when performance changes.
Common signs include:
Unstable arc
Burn-back
Irregular wire feeding
Excessive spatter
Poor gas coverage
Increased electrical resistance
Replace consumables according to wear rather than a fixed number of welding hours.
Check:
Liner condition
Contact-tip size
Drive-roll pressure
Cable bends
Welding wire
Check:
Welding parameters
Shielding gas
Contact-tip wear
Gas nozzle
Electrode stick-out
Possible causes include:
Welding above the verified current rating
Exceeding duty cycle
Loose electrical connections
Worn contact tip
Damaged cable assembly
Excessive arc-on time
Check:
Gas nozzle
Gas diffuser
Gas flow
Gas leakage
Spatter blockage
External drafts
Troubleshooting should consider the complete welding system rather than the torch alone.
The BND Series is suitable for welding distributors and aftermarket suppliers that require complete welding guns together with recurring replacement consumables.
A professional BND product program can include:
BND300 complete welding guns
BND400 complete welding guns
Contact tips
Gas nozzles
Gas diffusers
Liners
Torch necks
Handles
Triggers
Cable assemblies
Rear connectors
Power pins
Consumable kits
Publishing exact INWELT part numbers can help reduce replacement errors and simplify inventory management.
INWELT supplies BND Series welding guns and replacement components 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 developed according to the target welding machine and market requirements.
Customization may include:
Customer branding
Handle marking
Product labels
Cable length
Torch neck
Rear connector
Power pin
Contact-tip system
Liner configuration
Consumable kits
Private-label packaging
Barcodes
Carton requirements
For OEM projects, provide the welding-machine model, wire feeder, required current, wire diameter, connector and estimated purchasing quantity.
The current INWELT BND Series combines professional air-cooled welding guns with serviceable front-end and cable components.
The current category includes:
BND300
BND400
Air-cooled construction
60% duty-cycle configurations
0.6–1.6 mm wire coverage across the range
3.6 m / 4.6 m cable options
Bernard-style consumable architecture
Contact tips
Gas nozzles
Diffusers
Liners
Torch necks
Cable assemblies
OEM and private-label supply
For welding equipment brands, distributors and importers, sourcing complete guns and related replacement components through one supplier can simplify purchasing and aftermarket support.
The current category includes:
BND300
BND400
Yes.
The current BND300 and BND400 products are air-cooled MIG/MAG welding guns.
The current INWELT BND300 specification lists up to 300A with a 60% duty cycle.
The BND400 is positioned as the higher-current model in the current BND range.
INWELT should confirm and publish its final rated-current value consistently across the product page, category page and technical documentation.
The current BND300 specification lists approximately:
0.6–1.6 mm
The current BND400 specification lists approximately:
0.9–1.6 mm
Current BND Series configurations include:
3.6 m
4.6 m
The BND Series is designed around common Bernard-style replacement formats.
However, contact tips, diffusers, nozzles, liners, necks and power pins should always be confirmed by exact part number and torch configuration.
No.
Different consumable systems can use different tip, diffuser, nozzle, liner and power-pin relationships.
No.
The BND Series is independently manufactured by INWELT.
Third-party trademarks and model references are used only to describe replacement or compatibility formats where applicable.
Yes, when configured with the correct wire, shielding gas, liner, contact tip and welding parameters.
They can be used as part of an appropriately configured aluminum MIG system, but the liner, contact tip, drive rolls and wire-feed setup must be selected specifically for soft aluminum wire.
Yes.
OEM/ODM, private labeling, cable customization, connector configuration and consumable-kit options are available for qualified B2B customers.
For faster model selection and compatibility confirmation, provide:
Welding-machine manufacturer and model
Wire-feeder model
Required welding current
Welding-wire diameter
Existing MIG gun model
Rear connector / power-pin photograph
Required cable length
Required consumables
Estimated purchasing quantity
INWELT or private-label branding
INWELT can then recommend the appropriate BND300 or BND400 configuration for your welding system.
