In resistance welding method work pieces are welded because of a combination of a pressure applied to them and localized heat generated by a high electric current flowing via contact area of the weld.
Required heat is generated at the junction because of flowing current through it and resistance offered.
It consists of work piece to be welded, two opposing electrodes a mechanism to apply pressure to squeeze the work pieces.
AC power supply to maintain the current and a circuit breaker with times to stop the flowing current after a preset time.
Heat produced by the current is adequate for local melting of the work piece at the contact point and formation of small weld pool.
The molten metal is then solidifies under a pressure and joins the pieces.
In resistance welding low, medium and high carbon steels, alloy steels, aluminium alloys will be welded.
ADVANTAGES:
High welding rates
Low fumes
Cost effectiveness
Easy automation
No filler materials are required
Low distortions.
DISADVANTAGES:
High equipment cost
Low strength of discontinuous welds
Thickness of welded sheets is limited upto 6 mm
APPLICATIONS :
Used for joining of fuel tanks, water pipeline and gas oil pipelines, wire end, railway tracks vehicle body parts.
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