Welding Preparation

See Service Precautions for Safety other related information. In addition, consult Cutting and Welding Symbols chart (Below) before performing any operation that would require either of these duties. Service Precautions

Where 'resistance spot welding' is employed, the zinc coating should be lightly abraded away on the mating surfaces and those in contact with the electrode tips. Do not remove more of the zinc coating than is absolutely necessary.

Before welding, a weld-through primer or inter-weld sealer should be applied.

Contamination of the weld will occur if the plating is not removed, thus making the joint less strong; another side effect of this will be a greater need for electrode tip dressing and increased tool down time.

In exceptional cases where the plating must remain intact, increase the tip pressure and welding current by 10 to 20%. Where MIG welding is used as an alternative to resistance spot welding for plug, butt welds, or limited access, the problems caused by the presence of zinc coating are much the same as those previously mentioned. There may also be the added problems of increased weld spatter and nozzle contamination.

CUTTING AND WELDING SYMBOLS:





CAUTION: Reference should always be made to the welding tables and illustrations in the relevant procedures. Observe all safety precautions with respect to yourself, other people, your equipment and the workplace. Service Precautions