电器电流钝化

遇到的孔问题在焊接过程中非常常见,焊接材料干燥,底座金属和焊接耗材,焊接过程不够稳定的油和杂质,保护穷人将不同程度的口干。焊接孔隙率的分类,喷孔基本原因是由于熔融金属的高温来溶解大量气体,焊接中的气体部分在结晶时间逃逸,形成孔隙。

根据所产生的气体组成,焊接后焊接金属中的孔隙率主要是氢气和CO气孔。对于低碳钢焊接,焊接表面中的氢气孔在大部分孔螺纹的横截面的情况下,从焊缝表面观察时孔螺钉形状,光滑的壁扬声器口。由于高温,熔融浴中的氢溶解度和金属液滴在焊接过程中焊接金属的快速凝固,氢气过晚以逸出,形成在焊接气体中。孔的CO产生主要是由于冶金反应产生焊接内部结晶中的CO气体。沿晶体取向的气孔分布具有蠕虫状外观。影响气体毛孔的因素是冶金和工艺。冶金方面的主要影响焊接材料在焊接过程中的焊接工艺,保护气氛的性质,焊接前焊接的材料原始条件,例如,水分的影响,焊接孔隙腐蚀。焊接孔隙腐蚀一代。焊接过程作为冶金工艺,具有与普通冶金,短反应时间和保护气氛不同的特点,使得焊接金属和基础金属材料,组织微观差异存在。熔渣气孔敏感性的氧化纤维敏感性具有很大的影响,实验表明,酸性和碱电极CO气孔倾向随着渣氧化抗性的增加而增加。 But the tendency of the hydrogen hole to the contrary. Than the CO due to the hydrogen in the metal structure of Compliance Compliance so often taken suppressed in order to achieve to maintain slag appropriate oxidizing hydrogen. It is also used in the actual welding production such methods. Added with strong oxidizing acid electrode composition. Hydrogen generation of the hole can be prevented. The alkaline electrode was added fluorite, often contain a certain amount of carbonate. During the welding process, the welding arc heating effect of Fe203 decomposition emits O generated Fe30 Fe | 0 HO reaction at a high temperature to regenerate Fe20, and H, elemental Fe and HO FeO and H is generated at high temperatures, can be seen rust for the formation of two types of pores have a greater impact. Normal welding operation welding specification for the formation of weld porosity have a certain impact, but to take appropriate specifications for operation, welding current, welding voltage have little impact on the formation of pores in the low-carbon steel welding.

在低碳钢焊接时,焊缝熔合区夹杂物会导致焊缝金属的韧性降低,增加热裂和层状撕裂的倾向。焊缝中的夹杂物主要是氧化物、氮化物和硫化物。氧化物夹杂物一般以硅酸盐、硅的形式存在;氧化夹杂物主要是由于焊接过程中发生冶金反应而产生的,实际焊接过程中在焊接材料和选择适当的情况下由于焊接操作不当而混合的焊缝中氧化夹杂物是少量的。氮化物主要混合在低碳钢焊接中,时效过程中焊接金属析出Fe4N,呈针状分布在晶粒中或通过晶界,导致焊缝金属韧性下降。低碳钢焊接时,氮气的来源为周围大气,即从周围大气中渗透到熔池中而氮气是由于夹杂物而造成的,焊接过程中保护不良主要是由于氮化物夹杂物的形成。硫化物中的硫主要来自于焊接材料,如焊条涂层、焊剂、焊缝硫化物MnS和FeS。焊接夹杂物造成实际焊接生产的原因一般有:焊接选用不正确或不合理;焊接规范不适当,如焊接电流、焊接电压不适当导致炉渣难以上浮;点焊和多焊,焊缝不清渣; welding, the angle of the electrode and the transport bar inappropriate molten metal and slag mixed together; the poor weld pool protection operation, the air intrusion welding protective atmosphere.

防止低碳钢管焊缝缺陷的技术措施

焊接材料的选择直接影响焊接金属的性能和组成,对防止和控制焊接缺陷具有非常重要的意义。处理因素包括焊接规格的各个方面,电流和焊接操作的类型。The appropriate choice of welding power supply for welding materials is a prerequisite for the prevention of welding defects.焊接设备更换迅速,由于电子技术的快速发展,焊接电源也在经历深刻的转变。对于普通低碳钢管焊接材料,普通焊接设备施工。但导致的设备操作的良好性能不容忽视。必须准备合理的前提装备条件有针对性的焊接过程措施。包括焊接规格,电流型,焊接操作,凹槽和层清洁工艺要求。焊接规格包括焊接电流,焊接电压,焊接速度和其他参数。焊接操作应在正常规格中进行。 In the case of the welding voltage. The welding current increases will lead to the increase of the depth of penetration of the molten bath; in the case of welding current, welding voltage increases will lead to the increase in the width of the bath melt; but the current increases. Result in the arc transition molten metal particles decreases. Ratio of the surface area increases, the gas absorbed by the transition of molten metal particles Multiple increased stomatal tendency; arc voltage caused by increased the welding protective atmosphere decreased, outside air easily penetrated; welding speed increases, so that the crystallization speed is increased, but also easy to make the residual gas The increased tendency to cause holes in the weld metal. Therefore, as far as possible to maintain the normal construction norms conducive to the generation of defects.

逢钢管规范,标准和识别

焊接钢管(用焊接制造的钢管)是由扁平板制成的管状产品,称为Skelp,形成,弯曲并为焊接制备。

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