Key points for hot galvanized steel structural parts production

Acid or liquid flux never welded parts to penetrate in the galvanizing process, this liquid oozing after galvanizing, resulting in non-galvanized zinc or zinc dissolution.

Temperature difference caused by the uneven distribution of thickness, the thermal expansion or contraction caused not only plate deformation, and has the potential to weld cracks around. Large plate area at the back of galvanized bolts were used to connect as well. Must be galvanized to be in every one of more than 400cm2 welded bolts. There may weld cracks occur, so the minimum weld length should be more than 500mm. Furthermore, if there is welded around the pit, will enter the water from here, due to the expansion of the water will cause deformation plate, so be careful when welding operations.

Welding slag will cause the zinc plating is not, it must be removed when the hot-dip galvanizing. Pre-treatment is usually carried out in a hot-dip galvanizing plant can not be removed, must first jet chisel by sandblasting or mechanical impact, etc., can be completely removed. In addition, the spatter generated during welding, to the detriment beautiful, must be removed. When hot-dip galvanizing of component welding, must be removed slag, spatter. In order to more easily remove the slag, ilmenite type electrode must be selected, or coated with the spatter adhesion preventing agent, and then welded.

Steel machining parts, due to the assembly ribs, complex shape of the member, is likely to cause deformation and damage, should be divided into a number of simple components, were galvanized, then bolted as well.