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首页> 外文期刊>Journal of Manufacturing Processes >Investigations on induced residual stresses, mechanical and metallurgical properties of CO_2 laser beam and pulse current gas tungsten arc welded SMO 254
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Investigations on induced residual stresses, mechanical and metallurgical properties of CO_2 laser beam and pulse current gas tungsten arc welded SMO 254

机译：CO_2激光束和脉冲电流气体保护钨极电弧焊SMO 254的感应残余应力，力学和冶金性能的研究

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摘要

This research article focuses on the joining of SMO 254 stainless steel by autogenous CO2 Laser beam welding and pulsed current gas tungsten arc welding (PCGTAW) with ERNiCrMo3 filler. The studies proved that full penetration could be achieved on the weld joint of a 5 mm thick plate with a reduced heat input of 120 J/mm in the laser welding while in the case of PCGTAW it was 3032 J/mm. An attempt is made to do a comparative evaluation of the microstructure changes which have occurred owing to welding and thereby the mechanical properties. The studies revealed the lack of deleterious phases in both welding techniques. Presence of grain boundary thickening near the fusion zone and elemental segregation was observed in PCGTAW joints. The residual stress measurements by X-ray diffraction method were executed over the cross-section of the two different weldments. An attempt is made to represent the stresses variation along the weld region, heat affected zone and the base metal graphically. The tensile test validated that in every case the rupture ensued at the base metal and the higher weldment hardness than base metal proves the soundness of the joint.
机译：本文研究的重点是通过自发光CO2激光束焊接和脉冲电流气体钨极电弧焊（PCGTAW）与ERNiCrMo3填料的连接来连接SMO 254不锈钢。研究证明，在5mm厚的钢板的焊接接头上可以实现完全熔透，而在激光焊接中输入热量减少120 J / mm，而PCGTAW则为3032 J / mm。试图对由于焊接而产生的微观结构变化进行比较评估，从而对机械性能进行比较。研究表明，两种焊接技术都没有有害相。在PCGTAW接头中观察到在融合区附近存在晶界增厚和元素偏析。在两个不同焊件的横截面上执行通过X射线衍射法测量的残余应力。试图用图形表示沿焊接区域，热影响区和母材的应力变化。拉伸试验证明，在每种情况下，母材都会产生破裂，并且焊接硬度高于母材，证明了接头的牢固性。

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