摘要
对壁厚(11+2)mm的L360QB/316L复合管进行了环焊,基层采用手工电弧焊,过渡层及覆层采用背部充氩保护的TIG焊;对其焊接接头进行拉伸、弯曲、刻槽锤断及晶间腐蚀试验评价了环焊缝的性能,采用光学、扫描电镜对焊接接头的显微组织及主要合金元素的扩散进行了分析。试验结果表明:环焊缝焊接接头性能良好且具备耐晶间腐蚀性能;环焊缝组织明显分为合金钢层、扩散层、过渡层、不锈钢层四个区,过渡层对不锈钢层焊缝起到了很好的隔离作用;环焊缝焊接接头中不锈钢层焊缝沿水平方向的硬度分布基本未发生明显变化,焊缝、热影响区、母材的力学性能差异不大。
The L360QB/316 clad pipe with thickness of （1 I＋2） mm was welded by birth welding. TIG welding with argon shielding on the back of the metal was used to weld transition layer and clad material, and shielded metal arc welding was used to base material. The tensile strength, bending strength, nick-break test and intergranular corrosion test were carried out to study the properties of the girth joint. The microstructure and diffusion of the major alloying elements were analyzed by optical microscopy, SEM and chemical analysis. The results show that the properties of the welded joint of girth joint accords with relevant standards rand and the girth joint can resist intergranular corrosion. The weld seam can be obviously divided into four layers including base layer, diffusion layer, transition layer and stainless layer. The transition layer can separate the diffusion of the major alloying elements between clad material and base material. The horizontal microhardness distribution of stainless steel joint has no significant change which indicate that the mechanical properties of the clad metal/heat affect zone/clad weld has little difference.
出处
《热加工工艺》
CSCD
北大核心
2013年第5期188-190,194,共4页
Hot Working Technology
关键词
复合管
焊接工艺
过渡层
微观组织
显微硬度
clad pipe
welding process
transition layer
microstructure
microhardness
作者简介
朱丽霞（1980～），女，广东省五华人，工程师，硕士，主要研究方向：油气输送管材料的显微组织与性能；电话：13572045429；E-mail：zhulx@cnpc．com．cn
