摘要随着科学技术的发展，薄板不锈钢在国防、化工、电子等领域被广泛使用，于是人们对焊接工艺也提出了更高的要求，解决焊缝成形和焊接变形问题尤为重要。本课题利用TIG焊设备对2mm的1Cr18Ni9Ti不锈钢薄板进行TIG焊工艺试验，采用的焊丝为304LM，通过多组参数的试验对比，研究和探讨了影响不同工艺参数对焊接质量的影响，得出焊接2mm不锈钢薄板的最优参数为：焊接电流180A，焊接速度2。7m/min，填丝速度0。4m/min 。87893

硬度试验结果表明：在该工艺条件下，母材离焊缝中心越近，其硬度值稍有升高，焊缝平均硬度约为HV215,母材平均硬度约为HV200左右。

金相试验结果显示1Cr18Ni9Ti母材为γ组织，熔合区为γ+蠕虫状的δ-铁素体，焊缝区为γ+δ组织。

毕业论文关键词  不锈钢 薄板  TIG  焊接工艺  硬度  金相组织

毕业设计说明书外文摘要

Title   The study on TIG welding technology of stainless steel sheet 

Abstract As the development of science and technology, stainless steel sheet has been widely used in national defense,chemical industy,tronics industry and other areas。So people set higher requirement for welding technology。 It is particularly important to solve the problem of welding deformation and welding deformation。In this project，the TIG welding equipment is used to conucting TIG welding technolog experiment for stainless steel sheet which is made of 1Cr18Ni9Ti with the length of 3mm。 The welding wire used is 304LM。 Through the comparison of multiple sets of parameters, the he influence of different process parameters on the welding quality was studied and discussed。The optimal parameters for welding 3mm stainless steel sheet are obtained: welding current 180A，welding speed 4。5mm/s, Wire feeding speed 0。4m/min。

The results of hardness test show that under the conditions of this process, Closer to the center of weld line , the higher its hardness is。 The hardness of the weld line center is about 210Hv, and the hardness of the base material is about 200Hv。

The results of metallographic test show that the fusion line between the weld and the base metal is obvious。 The filler metal and the base metal are connected well。The quality of welded joint is good。

Keywords   stainless steel  TIG  welding technology Hardness test    Metallographic test 

目    录

1  绪论 1

1。1  TIG焊的概念 1

1。2  TIG焊接不锈钢薄板的优点 1

1。3  目前的TIG焊技术 2

1。4  TIG焊接技术的展望 3

2  实验设备及材料 5

2。1  实验设备 5

2。1。1  焊接设备 5

2。1。2  试验测试与分析设备 7

2。2  实验材料 8

2。2。1  焊接母材 8

2。2。2  焊接材料 9

2。2。3  奥氏体不锈钢焊接工艺特点 10

2。3  试验方法 10

3  前期工艺试验 12

3。1  自熔焊工艺 12

3。1。1  自熔TIG焊焊机基本参数调节