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首页> 外文期刊>SAE International Journal of Materials and Manufacturing >Gas Metal Arc Welding Process Parameter Optimization to Reduce Porosity Defect in a Longitudinal Seam Welding of Pressure Vessels
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Gas Metal Arc Welding Process Parameter Optimization to Reduce Porosity Defect in a Longitudinal Seam Welding of Pressure Vessels

机译：气体金属电弧焊接工艺参数优化，减少压力容器纵向焊缝孔隙率缺陷

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摘要

Pressure vessels are critical equipment used in industries for storing liquids or gases at a pressure significantly different from ambient conditions. Porosity is one of the major weld defects in pressure vessels that leads to failure during inspection and as well as during its service. Gas Metal Arc Welding (GMAW) process is widely used in industries to fabricate pressure vessels using carbon steel "IS 2062 E250BR" material for storing compressed air. The main objective of this article is to reduce the porosity defect in the longitudinal seam (LS) welding of the pressure vessels. Detailed analysis is carried out to identify the parameters which are influencing the porosity defect. Central Composite Design (CCD) and Response Surface Methodology (RSM) approaches are used to find the optimum value of the weld parameters which produce weld without porosity or any major defects in the pressure vessel. An experimental setup has been established and welding experiments have been conducted under a controlled environment. Experiments were conducted without any external disturbances ensuring clean weld surface and filler wire without any moisture, rust, oil, and the presence of any organic materials. For all the weld specimens, visual and radiography examinations were carried out to identify the severity of porosity. A porosity index is proposed in this study for conducting statistical analysis. Statistical analysis shows current, travel speed, gas flow rate, and torch angle have a linear relationship and stickout distance has a nonlinear relationship with porosity. In square term, stickout distance has a significant influence on porosity defect. In two-way interaction studies, current and gas flow rate, current and torch angle, and travel speed and torch angle have a significant influence on porosity. Confirmatory tests were carried out to validate the optimum weld parameters obtained in this study.
机译：压力容器是用于在与环境条件显着不同的压力下储存液体或气体的行业的关键设备。孔隙度是压力容器中的主要焊缝缺陷之一，导致检查期间的故障以及在其服务期间。气体金属弧焊（GMAW）工艺广泛应用于使用碳钢制造压力容器的行业，“是2062 E250BR”材料，用于存储压缩空气。本文的主要目的是减少压力容器的纵向接缝（LS）焊接中的孔隙缺陷。进行详细分析以确定影响孔隙率缺陷的参数。中央复合设计（CCD）和响应表面方法（RSM）方法用于找到焊接参数的最佳值，在没有孔隙率的情况下产生焊缝或压力容器中的任何主要缺陷。已经建立了实验装置，并在受控环境下进行了焊接实验。在没有任何外部干扰的情况下进行实验，确保无任何水分，锈，油和任何有机材料存在的清洁焊接表面和填充线。对于所有焊接标本，进行视觉和射线照相检查以识别孔隙率的严重程度。在该研究中提出了一种孔隙度指数来进行统计分析。统计分析显示电流，行驶速度，气体流速和割炬角度具有线性关系，并且粘滞距离具有与孔隙率的非线性关系。在方形术语中，粘滞距离对孔隙缺陷具有显着影响。在双向相互作用研究中，电流和气体流速，电流和割炬角度，行进速度和割炬角对孔隙率具有显着影响。进行确认测试以验证本研究中获得的最佳焊接参数。

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