论文部分内容阅读
众所周知,焊缝中的气孔不仅削弱了焊缝的有效工作断面,同时也会带来应力集中,显著降低焊缝金属的强度、塑性和疲劳强度。因此,如何防止焊缝中形成气孔,确保产品质量,乃是当今焊接工作者的重要课题。 1、焊缝金属产生气孔的原因焊接时熔化金属不可避免地要受到周围空气的影响,同时在金属、熔渣与气相之间要进行各种复杂的化学冶金反应过程。宏观上可以认为焊缝产生气孔的根本原因是熔池
It is well known that the pores in the weld seam not only weaken the effective working section of the weld but also bring about stress concentration which can significantly reduce the strength, ductility and fatigue strength of the weld metal. Therefore, how to prevent the formation of pores in the weld, to ensure product quality, but today’s welding workers an important issue. 1, the reasons for the production of stomatal weld metal welding molten metal will inevitably be affected by the impact of the surrounding air, while in the metal, slag and gas phase to carry out a variety of complex chemical metallurgical reaction process. Macro can think that the root cause of weld porosity is pool