Galvanized steel pipe has the advantages of corrosion resistance and long service life, and the price of corresponding galvanized pipe is relatively cheap, so its utilization rate is also getting higher and higher now, but the user does not pay attention to the unnecessary trouble when welding galvanized pipe, so what should we pay attention to when welding galvanized pipe?
2. Welding characteristics of galvanized steel镀锌钢通常在低碳钢上涂上一层通常为20um厚的锌。锌的熔点是419°。在焊接过程中，锌被融化成一种液体，漂浮在熔池表面或焊缝根部。锌在铁中具有较大的固溶性，锌溶液会沿晶界被吸收而加深对焊缝金属的刻蚀，低熔点组成锌;液态金属脆化。
Galvanized steel is usually coated with a layer of zinc, usually 20 um thick, on mild steel. The melting point of zinc is 419 °. During welding, zinc is melted into a liquid, floating on the surface of the weld pool or at the root of the weld. Zinc has a large solid solubility in iron. Zinc solution will be absorbed along the grain boundary to deepen the etching of weld metal. Low melting point composition of zinc; liquid metal embrittlement.
When talking about Sino US economic and trade issues, a spokesperson of the Ministry of Commerce pointed out that trade frictions caused by the US side had different degrees of impact on Sino US enterprises. As far as Chinese enterprises are concerned, generally speaking, the impact is limited and the risk is controllable, mainly because some export-oriented enterprises are affected to varying degrees. And cracks. The weld fillet, especially the T-joint fillet, is prone to crack penetration. When welding galvanized steel, there is a groove between the surface of right straight welded pipe and the edge of zinc layer. Under the action of arc heat effect, oxidation, melting and transpiration, white smoke and steam are reported by wave, which is easy to cause weld porosity. The melting point of ZnO formed by oxidation is about 1800 °. Above C, if the parameters are too small in the welding process, it will lead to ZnO slag inclusion. Because zinc becomes a deoxidizer. MgO or mgo-sio2 oxide slag with low melting point appeared. Secondly, due to the transpiration of zinc, a large number of white smoke and dust are produced in the spray, which can stimulate and damage the human body. Therefore, it is necessary to polish the weld of the zinc coating.
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