8008485_钱存_TIG-MAG复合焊接与MAG焊接成形对比_2017051213-钱存-tig-mag双电弧复合焊与单mag焊接成形对比.doc

摘要近些年来随着我国焊接技术发展迅速对工业制造的要求也越来越高。因此有着高效率和高质量的TIG-MAG双电弧复合焊接工艺也被更多焊接工作者重视。本课题研究单MAG电弧焊与TIG-MAG双电弧焊的焊缝成形不同通过单MAG焊、TIG-MAG焊、MAG-TIG焊三种焊接方式的成形样貌对比得出结论。试验结果表明：MAG-TIG双电弧复合焊焊接相比单MAG电弧焊焊接低合金高强钢Q345-B焊缝余高从2.5mm增大到2.67mm焊缝熔宽从4.33mm增宽到4.67mm；TIG-MAG双电弧复合焊相比单MAG电弧焊焊接低合金钢Q345-B焊缝余高从2.5mm增大到2.83mm焊缝熔宽从4.33mm增宽到6.17mm；TIG-MAG双电弧复合焊焊相比MAG-TIG双电弧复合焊焊接低合金高强钢Q345-B焊缝余高从2.67mm增大到2.83mm焊缝熔宽从4.67mm增宽到6.17mm。关键词：MAG-TIG复合焊单MAG焊焊接成形AbstractInrecentyearswiththerapiddevelopmentofweldingtechnologyinChinatherequirementsforindustrialmanufacturingarebecominghigherandhigher.ThereforeTIG-MAGhybridweldingtechnologywithhighefficiencyandhighqualityhasbeenpaidmoreattentionbyweldingworkers.InthisstudytheweldingseamformingofsingleMAGarcweldingisdifferentfromthatofTIG-MAGdoublearcwelding.Aconclusionisdrawnbycomparingtheformingappearanceofthreeweldingmethods:SingleMAGweldingTIG-MAGweldingandMAG-TIGwelding.ThetestresultsshowthatcomparedwiththeSingleMAGarcweldingoflowalloyandhighstrengthsteelQ345Btheresidualweldheightincreasesfrom2.5mmto2.67mmandtheweldweldwidthincreasesfrom4.33mmto4.67mm.ComparedwiththeSingle-MAGarcweldingoflow-alloyhigh-strengthsteelQ345BTIG-MAGdual-arccompositeweldingincreasedtheresidualweldheightfrom2.5mmto2.83mmandtheweldweldwidthfrom4.33mmto6.17mm.ComparedwithMAG-TIGdual-arccompositeweldingforlow-alloyhigh-strengthsteelQ345Btheresidualweldheightincreasedfrom2.67mmto2.83mmandtheweldweldwidthincreasedfrom4.67mmto6.17mm.Keywords:TIG-MAGhybridweldingSingleMAGweldingweldingformation61第一章绪论1.1课题的背景及意义随着航天航空、交通运输、海军制造等工业的快速发展其外形尺寸、重量结构、质量要求也不断提高焊接工作量逐步上升优质高效焊接技术已经成为焊接工作者的研究对象经数据统计我国焊接工作量已经处于世界强国水平[1]。为了提高焊接生产效率有焊接方面的学者将双弧焊应用于中厚板的实际生产[2]。双电弧复合焊由两种焊接共同并列焊接完成生产效率大大提升。并且运用两种电弧的作用可以有效降低焊前预热温度甚至可以实现高强度焊前不预热[3]。因为焊前预热要求也很高[4]焊前预热有一定程度会导致焊接环境产生变化影响焊缝质量和工厂生产效率因此双弧焊有避免焊前预热的优势