Working Principle of Echo Sounder and Doppler Effect.pdf
Resistance welding
1. RESISTANCE WELDING
• Resistance Welding is a welding process, in which work pieces are
welded due to a combination of a pressure applied to them and a
localized heat generated by a high electric current flowing through the
contact area of the weld.
2. APPLICATION IN AUTOMOBILE
• USE
Spot welding is widely used in automotive
industry for joining vehicle body parts.
4. The following metals may be welded by
Resistance Welding
• Low carbon steels - the widest application of Resistance Welding
• Aluminum alloys
• Medium carbon steels, high carbon steels and Alloy steels (may be
welded, but the weld is brittle)
5. Advantages of Resistance Welding
• High welding rates;
• Low fumes;
• Cost effectiveness;
• Easy automation;
• No filler materials are required;
• Low distortions
6. Disadvantages of Resistance Welding
• High equipment cost;
• Low strength of discontinuous welds;
• Thickness of welded sheets is limited - up to 1/4” (6 mm);
