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Straight answers on choosing, fitting and looking after a larger lightweight air-cooled MIG torch and its short, long and flexible necks.
A torch in this class suits welders who need more current capacity than a light-duty torch gives, for general fabrication, structural work and thicker steel, while still wanting a lighter, easier-handling lead than a heavy-duty torch. Air cooling keeps the set-up simple, with no water cooler to maintain.For very long, continuous welds at high current, a water-cooled torch is usually a better choice. Compare the torch's rating for your gas and duty cycle with the work you actually do, and leave some margin.
Neck length is about reach. A short neck gives good control and keeps the torch handle close to the joint, a standard neck suits most general work, and long or extra-long necks reach into deep corners, inside boxes and over obstructions. The trade-off is that a longer neck is a little harder to hold steady.Pick the shortest neck that gives you clear access to the joint. Whichever length you choose, it must be the correct style and size class for your torch, because necks from different styles do not generally interchange.
A flexible neck can be bent to suit each joint, which is useful when you weld in many different positions or in confined spaces and do not want to change necks. A fixed swan neck holds its angle exactly, which suits repeat work where the same torch angle is wanted every time.A flexible neck should be bent gently and not forced into tight, repeated kinks, as this can wear it out or damage the parts inside. Always follow the maker's instructions for how far the neck can be bent.
The size number is a class that gives a rough idea of the current the torch can carry. The actual rating depends on the shielding gas, because torches are usually rated higher on carbon dioxide than on mixed gas, and on the duty cycle, which is the share of each ten-minute period you can weld without letting the torch cool.Pulsed welding can reduce the usable rating. Read the rating for your gas and duty cycle on the maker's data sheet and avoid working right at the limit for long periods.
Choose the shortest length that lets you reach the work from the wire feeder without pulling on the machine. An overly long cable tends to tangle and puts extra strain on the liner, while a cable that is too short pulls on the power source and stresses the connections.Plan where the machine will sit and how far you need to move. In use, keep the cable as straight as practical and clear of vehicles, moving equipment and sharp edges.
The liner must suit both the wire material and the diameter. Steel liners suit steel wire, whereas a plastic-type liner (such as PTFE or nylon) is generally used for aluminium wire, because the softer wire needs a low-friction path. A liner that is too tight causes jamming and shaving, and one that is too loose lets the wire buckle.Never run a torch without a liner. Check the torch manual for the right liner and bore whenever you change wire type or size.