Seam Welding

Questions and Answers

Seam welding can involve large amount of power especially in a continuous seam weld. This generates a lot of heat which must be removed. The weld wheels are cooled through the hub that attaches them to the machine. Unfortunately this can be a long distance from the actual weld face. Just as in spot welding we need cooling near the face to help maintain the wheel integrity. In higher heat applications external water may be required. Water tubes are installed on both sides of the wheel top and bottom and cool water is spray on the wheel and weld area. This of course can be very messy but necessary for some applications.

Electrode sticking to the work piece generally is caused by excessive heating between the electrode and the work piece. In the Relative Resistivity Diagram RC has become too large. Any factor which would cause this is an issue that must be addressed to prevent this manufacturing problem. In many cases this condition is accompanied with excessive surface expulsion.

Electrode Sticking

Electrode face mushrooming is the normal wear mechanism of a spot welding electrode. To slow this process or prevent excessive mushrooming one must control several factors in the welding process.

 Mushroomed electrode

EXTREME MUSHROOMING

Water for the electrode should always come directly from the water manifold and not be plumbed to use water from another weld machine component. Cooling water is the most important item to insure electrode life. Therefore the amount of water and its temperature are very critical.

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