Q345钢的埋弧焊工艺及性能研究
Study on Process Parameters and Properties of Q345 Steel in Using Submerged Arc Welding
李宗义1， 王泽荫1, 马跃洲2
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作者单位：（1. 甘肃机电职业技术学院， 甘肃 天水 741001； 2. 兰州理工大学， 甘肃 兰州 730000
中文关键字：力学性能； 埋弧焊； 工艺参数； 焊接缺陷； 显微组织
英文关键字：mechanical property; submerged arc welding; process parameters; welding defect; microstructure
中文摘要：以大型工字钢为例，探讨了Q345钢采用埋弧焊焊接时的工艺问题。结果表明，当采用合理的工艺参数和焊接顺序时，可有效防止焊件变形和裂纹产生；通过力学性能试验和显微组织分析，得知焊接接头的强度高于母材，塑性、韧性低于母材。
英文摘要：The main ingredients and mechanical properties of Q345 steel were introduced. By taking the large I-shaped steel for example, the process problems of Q345 steel in using submerged arc welding were discussed. The Results show that using reasonable technical parameters and welding sequence can effectively prevent the welding parts from deforming and cracking. By mechanical properties test and microstructure analysis, it can be known that the hardness and strength of the weld joints are higher than the base while the plasticity and toughness are lower.