Welding is done. The width of the workpiece must be equal although the ratio of the thickness must be less than 3:01.
1) In the first step the electrodes are brought to the metal surface and the pressure is applied.
Spot welding is a great form of resistance welding, which is a technique of welding two or more metal sheets jointly without by means of any filler material by pertaining pressure and heat to the area to be welded.
Spot welding is one such technique that is usually used to bond metals shaped into sheets that is not thicker than 3 millimeters. Just like any other welding technique even spot welding can produce clear-cut bonds without making excessive heating that can have an effect on the properties of the leftover sheets. This is pulled off by setting free a huge amount of energy in a short time in order to produce restricted and consistent welds. When it comes to galvanized steel then higher levels of current is required.
The immediate reply is yes, but it may be neither easy nor advisable in certain cases if brittle structures are produced by the different metals mixing in the molten nugget.
In exacting austenitic stainless steel and carbon steel is not generally spot welded jointly since the resulting nugget arrangement risks being hard and brittle, though it can be studied and modified using the Schaeffer diagram and particularly conceived warmth treating cycles.
Materials having widely dissimilar properties need that a warmth balance be achieved by compensation. The additional conductive material, electrically and thermally, have to be heated extra as it provides fewer resistive warmth, and the warmth is lost more easily by conduction.
An ordinary method uses an electrode of smaller face diameter and superior resistivity facing the additional conductive material, or by inserting a foil of poorly conductive material among them.
Concerning the number of sheets weldable with a single nugget, usual practice advices not more than three layers, although four sheets are infrequently spot welded jointly. In any case the ratio of the thickest to the thinnest sheet should not go beyond three.
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