采用等离子弧焊(PAW)深熔焊工艺对10mm厚的S22053双相不锈钢进行了焊接,采用显微组织观察、力学性能试验和腐蚀试验,研究了S22053双相不锈钢焊接接头的力学性能和耐蚀性。结果表明:焊接接头的强度达到814MPa,焊缝及热影响区的-40℃冲击吸收功分别为58J和72J;焊缝及热影响区的铁素体体积分数分别为69%和62%;ASTM A923 A法腐蚀测试表明,焊接接头焊缝和热影响区的耐蚀性下降,ASTM A923 C法检测表明,其未出现明显的点蚀现象,平均腐蚀速率为2.761mg/(dm²·d)。结果说明S22053双相不锈钢焊接接头具有良好的综合力学性能及耐蚀性,等离子深熔焊可用于S22053双相不锈钢的焊接制造。

The 10mm thick S22053 duplex stainless steel was welded by plasma arc welding (PAW). The mechanical properties and corrosion resistance of S22053 duplex stainless steel welded joint were studied by microstructure observation, mechanical property test and corrosion test. The results showed that the strength of welded joint reached 814 MPa, and the impact absorption energy at -40 ℃ of weld and heat affected zone was 58 J and 72 J, respectively. The volume fraction of ferrite in weld and heat affected zone was 69% and 62%, respectively. Corrosion test by ASTM A923 A method showed that the corrosion resistance of weld and heat affected zone of welded joint decreased. After testing by ASTM A923 C method, there was no obvious pitting corrosion phenomenon, and the average corrosion rate was 2.761 mg/(dm²·d). The results indicated that S22053 duplex stainless steel welded joint had good comprehensive mechanical properties and corrosion resistance, and plasma deep penetration welding could be used in the welding manufacture of S22053 duplex stainless steel.