Important Mig welding Tips
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What is Mig welding?
MIG/MAG welding is a versatile technique suitable for both thin sheet and thick section components. An arc is struck between the end of a wire electrode and the workpiece, melting both of them to form a weld pool. The wire serves as both heat source (via the arc at the wire tip) and filler metal for the welding joint
1. Keep a 1/4 to 3/8 in stick out (electrode extending from the tip of the contact tube.)
2. For thin metals, use a smaller diameter wire. For thicker metal use a larger wire and a larger machine. See machine recommendations for welding capacity.
3. Use the correct wire type for the base metal being welded. Use stainless steel wires for stainless steel, aluminum wires for aluminum, and steel wires for steel.
4. Use the proper shielding gas. CO2 is good for penetrating welds on steel but maybe too hot for thin metal. Use 75% Argon/25% CO2 for thinner steels. Use only Argon for aluminum. You can use a triple-mix for stainless steel (Helium + Argon + CO2).
5. For steel, there are two common wire types. Use an AWS classification ER70S-3 for all-purpose, economical welding. Use ER70S-6 wire when more deoxidizers are needed for welding on dirty or rusty steel.
6. For best control of your weld bead, keep the wire directed at the leading edge of the weld pool.
7. When welding out of position (vertical, horizontal, or overhead welding), keep the weld pool small for best weld bead control, and use the smallest wire diameter size you can.
8. Be sure to match your contact tube, gun liner, and drive rolls to the wire size you are using.
9. Clean the gun liner and drive rolls occasionally, and keep the gun nozzle clean of spatter. Replace the contact tip if blocked or feeding poorly.
10. Keep the gun straight as possible when welding, to avoid poor wire feeding.
11. Use both hands to steady the gun when you weld. Do this whenever possible. (This also applies to Stick and TIG welding, and plasma cutting.)
12. Keep wire feeder hub tension and drive roll pressure just tight enough to feed wire, but don't overtighten.
13. Keep wire in a clean, dry place when not welding, to avoid picking up contaminants that lead to poor welds.
14. Use DCEP (reverse polarity) on the power source.
15. A drag or pull gun technique will give you a bit more penetration and a narrower bead. A push gun technique will give you a bit less penetration, and a wider bead.
16. When welding a fillet, the leg of the weld should be equal to the thickness of the parts welded.
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