SA204B材料GMAW焊接工艺与应用

GMAW welding process and application of SA204B material

SA204B材料是压力容器用钼合金耐热钢,材料抗拉强度485~620MPa,屈服强度不小于275MPa。目前工程技术人员仅对材料的焊条电弧焊(SMAW)和药芯焊丝气体保护焊(FCAW)工艺进行了相关试验与研究,为了尽快推进材料的焊接自动化,对材料实芯焊丝气体保护焊(GMAW)工艺进行了相关试验研究与分析。FCAW焊接时,由于药芯成分含有稳弧剂、脱氧剂、造渣剂,具有良好的焊接工艺性,焊接过程需要逐层清理药皮,无法实现多层多道的连续自动焊。通过对SA204B材料进行GMAW焊接工艺的试验,该工艺可以满足SA204B材料焊接自动化条件。根据零部件结构形式,科学合理的选择施焊方法,拟定施焊工艺,在满足焊接接头质量要求条件下,使焊接设备开动率最大化,焊接成本最小化,最大限度提高焊接自动化应用范围。

SA204B is a molybdenum alloy heat-resistant steel used for pressure vessels.The tensile strength of the material is 485~620 MPa,and the yield strength is not less than 275 MPa.At present,engineers and technicians have only conducted relevant experiments and researches on SMAW and FCAW processes of materials.In order to promote the welding automation of materials as soon as possible,relevant experimental researches and analyses have been carried out on GMAW processes of solid cored welding wires.During FCAW welding,because the drug core contains arc stabilizing agent,deoxidizing agent and slag-forming agent,it has good welding technology.In the welding process,the drug coating needs to be cleaned layer by layer,and continuous automatic welding of multi-layer and multi-channel cannot be realized.Through the test of SA204B material GMAW welding process,the process can meet the automatic conditions of SA204B material welding.According to the structure of the parts,the welding method is selected scientifically and reasonably,and the welding process is formulated.Under the condition of meeting the quality requirements of welding joints,the operation rate of welding equipment can be improved to the maximum extent,the welding cost can be reduced to the maximum extent,and the application range of welding automation can be expanded to the maximum extent.