Sunnran Packaging Machinery Co., Ltd.
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Food can body welding machine
The main type of resistance welds used are (a) butt welds; (b) spot welds; and (c) seam welds. When considering any of these it must be remembered that in all types of resistance welding the basic principle is the fusion of two metals together.
When a sufficiently heavy electric current flows through a high resistance, intense heating takes place. This fact, of course, is employed in the common fuse, a thin piece of wire which is melted and breaks the circuit, if the current flowing exceeds the amount for which the fuse is designed.
In resistance welding, two electrodes, or two clamps, are incorporated in a circuit of low resistance and the metals to be welded together are pressed between the electrodes or held in the two clamps.
The circuit is thus completed and the electrical resistance at the joint of the metals to be welded together is so high, in
comparison with the rest of the circuit, that if the current is heavy enough the joint of the metals is heated to a plastic state necessary for the welding to take place