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在用市售的弹簧式电焊钳进行手工电弧焊时,焊钳的发热是一个老大难问题。当采用大电流施焊或进行深坡口、多层焊时,发热问题就更为突出。这种焊钳的发热通常是由下列两种原因引起的:1.焊钳与焊接导线的螺丝紧固处导电不良;2.没有按工艺要求选用焊钳与焊接导线的规格。也就是说,一般在焊条直径小于4毫米时,应选用300安的焊钳与截面为50毫米~2的导线;当焊条直径大于5毫米时,应选用500安的焊钳与截面为70毫米~2的导线。而在实际生产过程中,因500安的焊钳与70毫米~2的导
In the use of commercially available spring-type electric welding clamp for manual arc welding, the heating of the welding clamp is a chronic problem. When using high-current welding or deep groove, multi-layer welding, the heat problem is even more prominent. This kind of welding clamp heat is usually caused by the following two reasons: 1. Welding clamp and welding wire screw fastening poor conductivity; 2. There is no selection according to the requirements of welding clamp and welding wire specifications. In other words, generally less than 4 mm in diameter electrode should be used 300A welding clamp and cross-section of 50 mm ~ 2 wire; when the electrode diameter is greater than 5 mm, should be used 500A welding clamp and cross-section of 70 mm ~ 2 wires. In the actual production process, due to 500A welding clamp and 70 mm ~ 2 guide