Q460钢填充热丝激光窄间隙焊接头组织和力学性能的研究.pdfVIP

《热加工工艺》2022年9月第51卷第17期

Q460钢填充热丝激光窄间隙焊接头

组织和力学性能的研究

贾坤宁；段珍珍

（长春工程学院机电学院，吉林长春130012)

摘要：研究了Q460矿用救生舱用钢的填充热丝激光窄间隙焊工艺。利用金相显微镜、扫描电镜、拉伸试验机、冲

击试验机及显微硬度计进行了焊接接头的组织分析和性能测试。结果表明：当焊接速度为0.003m/s，激光功率为2

kW，离焦量为20mm，送丝速度为1.5m/s时，焊缝成形最佳。焊缝组织由侧板条铁素体、贝氏体和大量细小的针状铁素

体组成，粗晶热影响区组织由块状铁素体和粒状贝氏体组成。接头焊缝区强度最低，拉伸断裂部位为焊缝。焊缝区、热影

响区的平均冲击吸收功能分别为98.18、180.76J，冲击断裂模式均为韧性断裂。焊缝的显微硬度最高，平均硬度275

HV，其次为焊接热影响区，平均硬度为225HV。

关键词：热丝激光窄间隙焊；组织；力学性能

D0I:10.14158/j.cnki20202344

中图分类号：TG457.11;TG456.7文献标识码：A文章编号：1001-3814(2022)17-0035-03

ResearchonMicrostructureandMechanicalPropertiesofHot-wire

LaserNarrow-gapWeldingJointofQ460Steel

JIAKunning,DUANZhenzhen

(ElectricalandMechanicalCollege,ChangchunInstituteofTechnology,Changchun130012,China)

Abstract:Thehot-wirelasernarrow-gapweldingtechnologyofQ460minerescuecabinsteelwasstudied.

Metallographicmicroscope,SEM,tensiletestingmachine,impacttestingmachineandmicrohardnesstesterwereusedfor

microstructureanalysisandpropertytestoftheweldedjoint.Theresultsshowthatwhentheweldingspeedis0.003m/s,the

laserpoweris2kW,thedefocusamountis20mmandthewirefeedingspeedis1.5m/s,theweldformationisthebest.The

weldmirostructureiscomposedoffrriteside-plate,bainiteandalargeamountofacicularfrrite,andthemirostructureofthe

coarsegrainheat-affectedzoneiscomposedofmassivefrriteandgranularbainite.Thestrengthoftheweldzoneisthe

lowest,thetensilefractureistheweldzone.Theaverageimpactabsorptionenergyoftheweldzoneandtheheat-affectedzone

is98.18,180.76J,respectivelyandtheimpactfracturemodeisductilefracture.Themicroh