【摘要】：為了研究磁場對激光焊接的影響,采用在工件旁放置永磁鐵、提供橫向或者縱向常磁場對不銹鋼進行激光電流熱絲焊接的方法,結(jié)合焊縫橫截面形狀以及焊縫組織等,對不同磁場下激光熱絲焊接頭進行了分析。結(jié)果表明,磁場的加入對焊接過程和接頭形狀有顯著影響,適當?shù)拇鸥袘?yīng)強度能穩(wěn)定激光熱絲焊接過程,磁感應(yīng)強度過大則易造成大量飛濺;焊縫接頭的形狀隨磁場的方向、極性以及磁感應(yīng)強度的變化而改變;橫向磁場的加入能提高激光熱絲焊接效率;磁場還能減少焊縫柱狀樹枝晶區(qū)域,促進胞狀晶的形成,提高焊縫的顯微硬度值。外加磁場在焊接熔池中產(chǎn)生了安培力,安培力是攪拌熔池的主要作用力,從而改變液態(tài)金屬流動,造成激光熱絲焊接頭形狀和組織的改變。
[Abstract]:In order to study the effect of magnetic field on laser welding, the method of laser current hot wire welding of stainless steel with transverse or longitudinal constant magnetic field is adopted, which combines the shape of cross section of weld and the structure of weld, etc. The laser hot wire welding joints under different magnetic fields are analyzed. The results show that the addition of magnetic field has a significant effect on the welding process and the shape of the joint. The proper magnetic induction intensity can stabilize the welding process of laser hot wire, and if the magnetic induction intensity is too large, a large amount of spatter can be easily caused. The shape of weld joint changes with the direction of magnetic field, polarity and magnetic induction intensity, the addition of transverse magnetic field can improve the efficiency of laser hot wire welding. The magnetic field can also reduce the dendritic region of weld, promote the formation of cellular crystal, and improve the microhardness of weld. The applied magnetic field produces ampere force in the welding pool, which is the main force of stirring pool, which changes the flow of liquid metal and changes the shape and structure of laser hot wire welding joint.
【作者單位】： 華中科技大學材料科學與工程學院;
【基金】：國家九七三重點基礎(chǔ)研究發(fā)展計劃資助項目(2014CB046703)
【分類號】：TG456.7

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