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镀锌钢管焊接时需注意事项

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【 发布于:2018-02-25 14:18:32 】


济南镀锌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。锌的熔点在419°C,沸点908°C左右。在焊接中,锌熔化成液体浮在熔池表面或在焊缝根部位置。

Before the Ji'nan galvanized 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. The melting point of zinc is 419 C, and the boiling point is about 908 C. In welding, zinc melts into a liquid floating on the surface of the pool or at the root of the weld.

济南镀锌管

同时,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。如果焊接角焊缝,尤其是T形接头的角焊缝最容易产生穿透裂纹。镀锌钢管焊接时,坡口表面及边缘处的锌层,济南镀锌管在电弧热作用下,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。

At the same time, 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. If the welded corner welds, especially the T - shaped joint, are most likely to produce a penetrating crack. When galvanized steel pipe is welded, the zinc layer on the surface and edge of the groove will be oxidized, melted, evaporated, and even white smoke and steam will be produced by the galvanized pipe of Ji'nan under the arc heat. It will easily cause the weld porosity.

由于氧化而形成的ZnO,其熔点较高,约1800°C以上,若在焊接过程中参数偏小,将引起ZnO夹渣,由于Zn成为脱氧剂,产生FeO-MnO或FeO-MnO-SiO2低熔点氧化物夹渣。其次,由于锌的蒸发,挥发出大量的白色烟尘,对人体有刺激、伤害作用,因此,必须把焊接处的镀锌层打磨处理掉。

The ZnO formed by oxidation is relatively high melting point, which is about 1800 degree C. If the parameter is too small in the welding process, it will cause ZnO slag inclusion. Because Zn becomes a deoxidant, it produces FeO-MnO or FeO-MnO-SiO2 low melting point oxide slag. Secondly, because of the evaporation of zinc, a lot of white soot is emitted, which is irritating and harmful to the human body. Therefore, we must polish the galvanized layer of the welding place.

本文由济南镀锌管友情奉献,更多有关的知识请点击:我们将用最先进的技术,最真诚的态度,为您提供最为全面的服务。我们将会陆续向大家奉献,敬请期待。

This article is from Ji'nan galvanized pipe, friendship and dedication, and more related knowledge, please click: , we will use the most advanced technology and the most sincere attitude to provide you with the most comprehensive service. We will continue to contribute to you and look forward to it.



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