（2） 西安彩钢卷批发市场 在保证熔透的前提下，适当降低焊接电流，降低焊缝附近基体的过热程度
合金退火后的组织在焊缝附近不会形 西安彩钢卷批发市场 成连续的硬化线，在生产线上运行时也不会整齐断裂。
The ways to prevent such accidents are as follows:
(1) Strictly control the thickness difference when welding thin gauge galvanized steel strip, including the thickness difference when the specification changes, as well as the difference caused by the insufficient amount of shear waste when the head and
tail of galvanized steel strip are too thick, the latter may have a greater impact.
(2) Under the condition of ensuring the penetration, the welding current should be reduced properly to reduce the overheating degree of the matrix near the weld
(3) For normal production of thin plates, the welding process can be adjusted from continuous seam welding to intermittent seam welding. In this way, the unheated part formed by intermittent discharge will not have hardened structure, but will be transformed
into plasticity better than that of cold plate
The annealed structure of the alloy will not form a continuous hardening line near the weld and will not break neatly when running on the production line.
For the normal production of zinc plating line with very thin specification less than 0.23mm, it is better to select the welding machine with back fire wheel, which is characterized by a tempering wheel behind the welding wheel, which can make
the weld and the structure near the weld reheat to the tempering temperature (about 720 ℃), and the structure return to austenite state. At this time, the temperature of the surrounding matrix is higher, the temperature gradient decreases, and the cooling
speed slows down, which will change austenite into tempered structure, no longer have quenched structure, and can correct the flatness of the weld, so as to better prevent the fracture of the weld.