Читать книгу Welding Metallurgy - Sindo Kou - Страница 58

1 (a) An AC power source is preferred for heating the wire in order to avoid arc blow. With DC an electromagnetic force can be induced around the hot wire to deflect a DC welding arc, especially when the current is high.

2 (b) No, this process is not expected to be as effective for welding Al and Cu alloys because the low electrical resistance of these filler wires means ineffective resistance heating.

3 (c) High deposition rates can be obtained without using high arc powers, which can melt too much base metal to excessively dilute the deposit.