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我厂生产一批制件,由件1套筒(材料为45号钢)和件2螺母(材料为铝青铜QAl10—3)经螺纹连接后再焊接在一起(如图示)。铝青铜焊接性能较差,其主要原因是铝的氧化,焊接时铝与氧形成致密而难熔的Al:O:薄膜,熔滴表面上的AI:O。阻碍了母材与熔滴的熔合,熔池表面上的Al:O执薄膜阻碍着热源对熔池的加热,并使锌渣变粘,导致产生气孔和夹渣。焊接铝青铜材料,如工艺方法掌握恰当,采用铝焊,也可以得到较满意的焊接接头,然而
I plant a number of parts produced by the pieces of a sleeve (material 45 steel) and pieces of 2 nuts (aluminum bronze material for the QAl10-3) by the threaded connection and then welded together (as shown). Aluminum bronze welding performance is poor, the main reason is the oxidation of aluminum, aluminum and oxygen during welding to form a dense and refractory Al: O: film, droplet surface AI: O. Hinders the fusion of the base metal and the droplet, and the Al: O film on the bath surface obstructs the heating of the bath by the heat source and causes the dross to become sticky, resulting in porosity and slag inclusions. Aluminum bronze welding materials, such as the proper grasp of the process, the use of aluminum welding, but also can be more satisfied with the welded joints, however