What Is Galvanized Steel Welding?

Galvanized steel refers to galvanizing of ordinary carbon construction steel to effectively prevent corrosion and rust of the steel and thereby prolong the service life of the steel. Galvanization is divided into galvanizing and hot-dip galvanizing. ^[1]

Generally used in building exterior walls, such as glass curtain wall, marble curtain wall, aluminum plate curtain wall as pillars and stress materials, or used in outdoor telecommunication towers, highways and other open-air construction steel is called galvanized steel. Dip galvanized.

Easy to appear in the nugget

Select and strictly control welding process parameters. The evaluation of spot welding quality of galvanized steel refers to the strength and corrosion resistance of a single joint, and more importantly, the qualification rate of the joint under large production conditions. There are quite a few factors that affect welding quality in actual production, such as fluctuations in network voltage, shunting, electrode wear, and assembly quality. Since the range of welding parameters of galvanized steel is inherently small, strict control is needed, and adjustment is required when the thickness of the plate changes. Use reasonable electrode material, electrode shape and size, and trim or replace the electrode in time. Good cooling of the electrode is very important to ensure the welding quality.

Multi-pulse or * +,-. Current methods are used to weld galvanized steel. One is to increase the pre-heating and post-heating current, and the other is to increase the slow-rise and slow-down current. LANE et al. Studied the effect of changing the current by photographing the formation process of the nugget with high-speed photography. They believed that: 1) the change in current can promote the formation of the nugget; 2) the change in current before welding helps the formation of the nugget uniformly; "The current change after welding helps to confine the nugget and prevent spatter; 3) The simultaneous use of the current after welding and before welding can combine the advantages of both. This current change has been used in the welding production of galvanized steel. ^2]