超窄间隙焊接Q235/1Cr18Ni9Ti异种钢接头组织及力学性能
Microstructures and mechanical properties of welding joint of Q235/1Cr18Ni9Ti dissimilar steel with ultra-narrow-gap welding
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摘要: 超窄间隙焊接厚壁异种钢具有高效、低成本、接头力学性能优良的独特优势.文中研究了Q235/1Cr18Ni9Ti异种钢超窄间隙焊接接头的微观组织及力学性能.结果表明，打底焊的熔池以FA模式凝固，凝固组织为细小的奥氏体等轴晶及少量枝晶状铁素体.填充焊和盖面焊在靠近熔合过渡区的熔池区域以AF模式凝固，凝固组织为奥氏体胞状晶及胞状晶间铁素体，在远离熔合过渡区的熔池区域则以FA模式凝固，凝固组织为奥氏体柱状树枝晶及少量骨架状铁素体.异种钢超窄间隙焊接接头的抗拉强度和弯曲性能优良，Q235一侧HAZ未出现软化，熔合过渡区及其一侧HAZ的韧性优于焊缝区.Abstract: Dissimilar steels with thick wall welded by ultra-narrow-gap welding have some extra advantages in increasing welding efficiency, reducing production costs, improving mechanical properties of joint. In the paper, microstructures and mechanical properties of welding joint of Q235/1Cr18Ni9Ti dissimilar steels with ultra-narrow-gap welding were studied. The results indicated that welding pool of backing weld solidified with the FA solidification mode, and solidification microstructures were made of fine equiaxed grains of austenites and a few dendritic ferrites. Welding pool of filling bead and cover pass near the transition region of fusion solidified with the AF solidification mode, solidification microstructures are made of cellular austenites and ferrites between cellular austenites, welding pool of filling bead and cover pass far away from the transition region of fusion can solidify with the FA solidification mode, and solidification microstructures were made of columnar dendrite of austenites and a few skeleton ferrites. Ultra-narrow-gap welding joint of dissimilar steel had excellent tensile strength and bending property, and the heat affected zone near the Q235 base metal can not soften. Impact toughness of the transition region of fusion and the heat affected zone near the Q235 base metal was better than that of weld zone.
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Keywords:
- ultra-narrow-gap welding /
- dissimilar steel /
- microstructure /
- mechanical property
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