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中等厚度以上纯铝及铝合金的焊接已较广泛地应用熔化极自动氩弧焊。此法的优点是电流密度大,电弧穿透力强,与钨极氩弧焊相比,生产效率约提高三倍以上。厚度大于6毫米的焊件,钨极氩弧焊时需预热,而熔化极氩弧焊时,即使厚度达到30毫米焊件亦不必预热,节约了预热时问及成本。随着焊件厚度的增大,生产效率可进一步提高,例如,用钨极氩弧焊法焊接25毫米厚的纯铝板时需焊8层焊缝(焊接电流360—400安培),采用熔化极自动氩弧焊法只需焊接二层(焊接电流560安培)由于熔化极自动氩弧焊的电弧热量集中,焊接
More than the average thickness of pure aluminum and aluminum alloy welding has been more widely used automatic welding TIG. This method has the advantage of high current density, strong arc penetration, and TIG welding compared to about three times more efficient production. Thicknesses greater than 6 mm of weldment, TIG welding to be preheated, and melting amalgam, even if the thickness reaches 30 mm Weldment also do not have to preheat, saving warm-up time and cost. As the thickness of the weldment increases, the production efficiency can be further improved. For example, when welding a 25 mm-thick pure aluminum plate by TIG welding, an 8-layer weld (welding current 360-400 A) should be welded, Automatic TIG welding only two layers of welding (welding current of 560 amps) due to the fusion arc automatic arc welding arc heat concentration, welding