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镀锌钢管焊接时需注意事项

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【 发布于:2018-03-09 20:01:47 】


镀锌钢管焊接前必须把焊接处的镀锌层打磨掉,否则会产生气泡、沙眼、假焊等。还会使焊缝变脆,刚性下降。镀锌钢管一般是在低碳钢外镀一层锌,镀锌层一般在20um厚。锌在铁中具有较大固溶度,锌液体会沿晶界深入浸蚀焊缝金属,低熔点锌形成液体金属脆化。

Before the galvanized steel pipe is welded, the galvanized layer of the welding place must be worn away, otherwise the bubble, the trachoma, the false welding and so on will be produced. It will also make the weld brittle and the rigidity decrease. The galvanized steel tube is generally plated with a layer of zinc outside the low carbon steel, and the galvanized layer is generally 20um thick. Zinc has a larger solid solubility in iron, and the zinc solution has deeply eroded the weld metal along the grain boundary, and the low melting point zinc forms liquid metal embrittlement.

济南镀锌管

锌与铁可形成金属间脆性化合物,这些脆性相使焊缝金属塑性降低,在拉应力作用下而产生裂纹。镀锌钢管焊接时,坡口表面及边缘处的锌层,在电弧热作用下,产生氧化、熔化、蒸发以至挥发出白色烟尘和蒸汽,极易引起焊缝气孔。

Zinc and iron can form brittle intermetallic compounds. These brittle phases reduce the plastic properties of the weld metal and produce cracks under the action of tensile stress. When galvanized steel pipe is welded, the zinc layer on the surface and edge of the groove will generate oxidation, melting and evaporation under the action of arc heat, which will cause white smoke and steam to volatilize, which will easily cause the weld porosity.

镀锌钢管的焊前准备与一般的低碳钢是相同的,需要注意的是要认真处理好坡口尺寸和附近的镀锌层。为了焊透,坡口尺寸要适当,一般60~65°,要留有一定的间隙,一般为1.5~2.5mm;为了减少锌对焊缝的渗透,在焊之前,可将坡口内的镀锌层清除以后再焊。

The pre - welding preparation of galvanized steel pipe is the same as that of low carbon steel. It is necessary to pay attention to the proper handling of the groove size and the galvanized layer in the vicinity. For welding penetration, the groove size should be appropriate, generally 60~65 degrees, leaving a certain gap, usually 1.5~2.5mm. In order to reduce the penetration of zinc to the weld seam, before welding, the zinc coating in the groove will be removed before welding.

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