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H8WA型金属支柱是矿山不可缺少的支护设备,但该产品的主要部件活柱长期以来一直存在着焊缝开裂问题。这样就严重地危害矿工的生命安全,同时也给检验工作带来不便。活柱是山两槽钢(见图)焊接而成,材料为34SiMn。裂纹是在调直后出现的,一般情况下有10～20％的活柱出现裂纹,有时达30～400％。剖开已出现裂纹的活柱可以看出:呈黑色的裂纹绝大多数出现在焊缝端部(简称端部裂纹),裂纹长约20～40毫米,中间发黑的较少,且长度较短。呈黄色的裂纹出
H8WA-type metal pillars are indispensable support equipment for mines, but the main component of the product, the column has long been a problem of weld cracking. This will seriously endanger the lives of miners, but also to the inspection inconvenience. Pillar is the mountain two channel (see photo) welded together, the material is 34SiMn. Cracks appear after straightening, under normal circumstances 10 ~ 20% of the cracks occurred in the column, and sometimes up to 30 ~ 400%. Cut open cracked column can be seen: the vast majority of black cracks appear in the weld end (referred to as the end of the crack), the crack length of 20 to 40 mm, less black in the middle, and the length of more short. Yellow cracked