Fusion Welding Processes

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Presentation transcript:

Fusion Welding Processes Shielded Metal Arc Welding

Fusion Welding Processes Gas Metal Arc Welding

Fusion Welding Processes Gas Tungsten Arc Welding

Fusion Welding Processes GTAW Polarity: three different polarities in GTAW A. Direct-Current Electrode Negative (DCEN) B. Direct-Current Electrode Positive (DCEP) C. Alternating Current (AC)

polarities in GTAW process.

Fusion Welding Processes Plasma Arc Welding

Shielding Gases Both argon and helium can be used. Since it is easier to ionize argon than helium, arc initiation is easier and the voltage drop across the arc is lower with argon. Also, since argon is heavier than helium, it offers more effective shielding and greater resistance to cross draft than helium. Argon also has a greater oxide cleaning action than helium. These advantages plus the lower cost of argon make it more attractive for GTAW than helium.

Shielding Gases