Research on SAW Welding Properties of SA517 Gr.B

LI Juan; ZHANG Peiyao; WANG Gang; LIU Shan; DING Yanguang

doi:10.7512/j.issn.1001-2303.2023.12.04

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Research on SAW Welding Properties of SA517 Gr.B
Vol. 53, Issue 12, Pages: 28-32(2023)
Received：05 May 2023，

Revised：2023-11-19，

Published：25 December 2023
DOI： 10.7512/j.issn.1001-2303.2023.12.04
稿件说明：

移动端阅览

李娟，张佩瑶，王刚，等.SA517 Gr.B埋弧自动焊焊接性能研究［J］.电焊机，2023，53（12）：28-32. DOI： 10.7512/j.issn.1001-2303.2023.12.04.

LI Juan, ZHANG Peiyao, WANG Gang, et al.Research on SAW Welding Properties of SA517 Gr.B[J].Electric Welding Machine, 2023, 53(12): 28-32. DOI： 10.7512/j.issn.1001-2303.2023.12.04.

摘要

对SA517 Gr.B采用埋弧自动焊（SAW）的焊接接头进行力学性能、组织结构分布特征分析研究。研究结果表明，采用F76A2-EG-M4埋弧焊材，匹配适当的焊接工艺参数，结合焊前预热、后热等工艺措施，焊接接头力学性能优良；显微硬度最低点位于热影响区，说明受焊接热循环的作用热影响区出现了明显的软化现象，接头淬硬倾向不明显；焊缝和热影响区冲击断裂特征主要为剪切断裂，韧窝形貌，剪切断面率分别为90%和80%；焊缝组织以细小的针状铁素体为主，而热影响区组织以回火索氏体为主，析出了大量的碳化物，导致了冲击韧性下降。

Abstract

Mechanical properties and microstructure of SA517 Gr.B welded joint by Submerged Arc Welding (SAW) were analyzed and investigated.The analysis results show that adopting F76A2-EG-M4 welding consumbles

matching proper welding procedure parameters

combined with process treasures of preheat before welding and heating after welding etc.

the mechanical properties of welded joint exhibite excellent; the lowest microhardness is located in heated affected zone(HAZ)

it indicates HAZ appears apparent softening phenomenon under the function of welding thermal cycle

which made harden quenching tendency of welded joint isn't obvious; Impact fracture feature of weld and HAZ is shearing fracture mainly

and fracture morphology has a large number of dimples

shear section ratio is 90% and 80% respectively; the main microstructure of weld is fine acicular fettite

and microstructure of HAZ is dominated by tempered sorbite

a larger number of carbide precipitated in HAZ

which results in the decrease of impact properties.

关键词

Keywords

references

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