MIG/MAG Welding

MIG/MAG welding

Setting up the equipment and co-ordinating the welding parameters.

- Any joins that are MIG/MAG welded in production must also be MIG/MAG welded during repairs. Also during repairs, some resistance spot welds need to be replaced by plug welds.
- If access is difficult, or if a suitably powerful spot welder (see above) for total panel thicknesses of 3 mm or more is not available, resistance spot welding must be partially replaced by plug welding during repairs. In this case, the increased time needed and the correspondingly more demanding corrosion protection requirements, must be taken into account.
- Welding repairs can only be carried out properly if the equipment is set up correctly and all the welding parameters are co-ordinated.
- Equipment:
- Set up the equipment as directed by the manufacturer.
- The hoses must be untwisted.
- The core must be free of abraded rod particles.
- The gas and current nozzles must be free of slag and scale residue.
- Pay attention to the quality of the welding rod and the throughput of gas.
- Body:
- Make sure that the joint surface is perfect.
- Prepare a bare metal joint surface.
- Maintain the correct gaps (formation of roots).
- Notes on technique/method:

- NOTE:
- The increased application of heat during MIG welding destroys the welding primer/zinc layer over a much larger area than during resistance spot welding, as a result of which much more care needs to be taken when applying anti-corrosion protection afterwards.
- A test weld should always be carried out to make sure that the welded joint is not just a surface connection.

Attach the ground cable right next to the welding point (Make sure that good contact is made).

- During plug welding start welding on the lower panel to Make sure adequate penetration.