12Cr12/A105 异种钢焊接工艺研究

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中图分类号：TG44；TG47

Research on welding process of 12Cr12/A105 dissimilar steel

SHEN Jianlei （EBARA Machinery ZiBo Co.，Ltd.， ZiBo 255O0O，Shandong，China）

Abstract：Welding of dissimilar metals is a key technical challenge in modern chemical，energy and power equipment manufacturing，and the performance of the joint directly affects the safe operation and service life of the equipment.This study focuses on the connectionof disimilar materials，high-chromium martensitic heatresistant steel 12Cr12and ASTM A105 low-carbon forged steel，and systematically explores the weldability， microstructure evolution and mechanical properties of thedissimilar metal arc welding.E3O9L-16 austenitic stainless steel electrodes electrodes were selectedas filer metals，Welding joints with no macroscopic defects were fabricated using the filler metal. Comprehensive studies on the joints were conducted using chemical composition analysis，metalographic microstructure analysis，tensile，bending，impact，and hardnesstests.The results show that the tensile specimens of the joints all fractured onthe A1O5 base metal side，showing complete ductile fracture characteristics，and the weld strength was higher than that of the base metal，achieving equal strength matching.Research has confirmed that by choosing the appropriate austenitic stainless steel electrode and strictly controlling the welding process parameters，reliable welding of dissimilar steels 12Cr12 and A105 can be achieved，providing an important technological basis for the manufacturing and repair of key components such as power station valves and pipe transition sections.

Key words： A105；12Cr12； shielded metal arc welding；dissmilar steel welding;microstructure

0前言

随着能源与化工装备向高参数、大型化方向不断发展，异种金属焊接结构因其能够综合发挥不同材料的性能优势而得到日益广泛的应用。（剩余4205字）