Abimig AT 255 LW FAQs
Straight answers on choosing, fitting and looking after a lightweight air-cooled MIG torch of this size class and its swan necks.
Who is a lightweight air-cooled MIG torch of this size class suited to?
A lightweight air-cooled torch of this class suits light to medium fabrication, workshop repairs and general steel work, where the welder holds the torch for long periods and a lighter, more flexible lead reduces fatigue. Air cooling means no water cooler or hoses to look after.
It is not meant for heavy, continuous welding at high current, where a larger or water-cooled torch is the better fit. Check the rating on the torch against the current and the gas you actually use, and choose a torch with some margin.
What does the size number in the torch name tell me about its current rating?
The number in a torch name is a model or size class, not a guaranteed rating, so do not assume it equals the current you can weld at. The real rating depends on the shielding gas, because a torch is usually rated higher on carbon dioxide than on mixed gas, as argon mixes give a hotter arc. It also depends on duty cycle, which is how much of each ten-minute period you can weld without letting the torch cool.
Always read the rating for your gas and duty cycle on the torch's data sheet or data plate, and do not simply weld up to the headline number.
Which swan neck angle is best for my welding position?
Access and visibility matter most. Neck angles of about 45 or 60 degrees are both common for fillet welds, fabrication and joints with limited access, and a straight or shallower neck can suit open, flat work. The angle changes how the nozzle approaches the joint, so a tight corner usually needs more bend and an open joint less. Hand size, handle style and your own height can also change which angle feels best.
If you often weld in awkward positions, keep a second neck of a different angle or length. Make sure any neck you choose is the correct style and size class for your torch.
How do I choose the right liner for my wire?
The liner must match both the wire material and the wire diameter. Steel liners suit steel wire, while a plastic-type liner (such as PTFE or nylon) is generally used for softer aluminium wire because it creates less friction. Using a liner that is too tight causes jamming and shaving, and one that is too loose lets the wire buckle.
A torch should never be run without a liner. Fit the right type and bore size whenever you change wire, and check the torch manual for the correct liner for your cable length.