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如何防止镀锌带钢焊缝处整齐断裂事故?

返回列表 来源: 发布日期: 2020.03.04

如何防止镀锌带钢焊缝处整齐断裂事故?

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预防此类事故的方法如下:

(1)西安彩钢卷批发市场 严格控制薄规格镀锌钢带焊接时的厚度差,包括规格变化时的厚度差,以及镀锌钢带头部和尾部过厚时由于剪切废料量不足而造成的厚度差,后者可能会产生较大影响。

(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
(3) 对于薄板的正常生产,焊接工艺可由连续缝焊接调整为间断缝焊接。这样,间歇放电形成的未加热部分将不会有硬化结构,而是会转化为比冷板更好的塑性
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。
对于超薄规格小于0.23mm的镀锌线的正常生产,宜选用带后燃轮的焊机,其特点是焊轮后有回火轮,使焊缝及焊缝附近的组织再加热到回火温度(约720℃),组织回复到奥氏体状态。此时,周围基体温度较高,温度梯度降低,冷却速度减慢,将奥氏体转变为回火组织,不再具有淬火组织,并能纠正焊缝的平直度,从而更好地防止焊缝断裂。

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.
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