基于奥氏体焊材的Cr13型马氏体不锈钢MAG焊工艺

The MAG welding method of Cr13-type martensitic stainless steel based on Austenite Weld Metal

基于MAG焊接方法对水轮机抗磨板用Cr13型马氏体不锈钢进行焊接,焊接材料为E309LT1-1药芯焊丝,采用以下4组混合气体作为保护气体进行焊接对比试验:φ(Ar)97.5%+φ(CO2)2.5%、φ(Ar)95%+φ(CO2)5%、φ(Ar)90%+φ(CO2)10%、φ(Ar)80%+φ(CO2)20%,焊接接头经过RT探伤后,通过力学性能、金相和显微硬度试验分析不同保护气体组成对焊接接头质量的影响。结果表明,在CO2含量为2.5%、5%和20%时,在焊缝中发现了明显缺陷,而当气体组成为φ(Ar)90%+φ(CO2)10%时,接头没有发现缺陷,焊缝成形良好,达到了力学性能要求。

The Crl3-type martensitic stainless steel for the facing plate of hydraulic turbine using MAG welding method is investigated. The welding material is E309LT1-1 flux-cored wire. The welding contrast experiment is conducted with four different shielding gases： φ （ Ar ）97.5 ＋φ （ CO2）2.5% ,φ （ Ar ）95%＋φ （ CO2 ）5%,φ （ Ar ）90%＋φ （CO2） 10%,φ（ Ar ）80%＋φ （ CO2 ）20%. Welding joints ＇after RT detection,analyze the different effect of shielding gas composition on the welding joint performance by mechanical properties, metallographic and micro-hardness tests, The result indicates that,weld defect is found apparently wilh 2.5% ,5% and 20%CO2 as shielding gas. Weld joint with good properties can be obtained with φ（Ar）90%＋tp（CO2） 10% as shielding gas, and appearance of weld is good.