Seam Welding

Questions and Answers

I am going to assume that this question is being directed to the flood cooling water used in the seam welding process. This water may come from a cooling tower system and returns to the same system.  Normally it is treated in for particulates and the chemistry is evaluated and adjusted accordingly. This tower water will be reused over and over again.

More likely this flood water is on an independent system with a tap water make up which flows into a catch system to be recirculated on the seam welder itself for some period of time. The water itself is not harmful. It only is harmful from what it comes in contact with during seam welding. There is usually a considerable amount of steam, maybe smoke and some sparks possible. Some metallics can get into the water and sink to the bottom of the catch tank. The oils and other debris on the metal will change the water chemistry. The water will pick up what it is in contact with. It can be used over and over again for industrial cooling in the seam welding process. Make up water will be required to cover steam loss and evaporation.

In any long term reuse of this water in a plant water recirculating system or a dedicated seam welder recirculating system, the water should at the minimum be filtered for particulates and tested for pH, conductivity, and total dissolved solids.

Is used seam welding cooling water considered Potable water (Safe to Drink)?
NO!

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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