ZrO_2活性剂对309不锈钢钨极氩弧焊电弧特性及焊缝性能的影响
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摘要
以ZrO_2为活性剂(质量分数分别为0,0.25%,0.50%,1.00%)对309不锈钢进行钨极氩弧焊,研究了ZrO_2对焊接电弧特性、熔深以及焊缝组织和性能的影响。结果表明:添加ZrO_2焊接时电弧产生脉冲特性,电弧电压随ZrO_2质量分数的增加先减小后增大,焊后熔深均比未添加ZrO_2焊接时的大2倍以上;添加质量分数0.50%ZrO_2焊接后焊缝组织由奥氏体和少量%铁素体组成,部分区域奥氏体晶粒呈等轴状;少量ZrO_2的添加降低了焊缝区的硬度和弯曲屈服强度;随ZrO_2质量分数的增加,焊缝区的硬度降低,弯曲屈服强度先减小后增大,热导率减小,比热容增大。
309 stainless steel was tungsten inert gas welded with ZrO_2 active flux(with mass fractions of 0,0.25%,0.50%,1.00%,respectively)and the effects of ZrO_2 on the welding arc characteristc,fusion depth,and on the microstructure and property of weld were studied.The results show that when welding with ZrO_2,the arc illustrated pulse characteristics.The arc voltage decreased first and then increased with increasing mass fraction of ZrO_2.The fusion depth after welding with ZrO_2 was more than 2 times larger than that after welding without ZrO_2.The weld obtained by welding with 0.50 wt%ZrO_2 possessed a microstructure of austenite and fewδferrite,and the austenite grains in some regions were equiaxed.The addition of a small amount of ZrO_2 decreased hardness and yield strength in bending of the weld zone.With increasing mass fraction of ZrO_2,the hardness of the weld zone decreased,the yield strength in bending decreased first and then increased,the thermal conductivity decreased and the specific heat capacity increased.
309 stainless steel was tungsten inert gas welded with ZrO_2 active flux(with mass fractions of 0,0.25%,0.50%,1.00%,respectively)and the effects of ZrO_2 on the welding arc characteristc,fusion depth,and on the microstructure and property of weld were studied.The results show that when welding with ZrO_2,the arc illustrated pulse characteristics.The arc voltage decreased first and then increased with increasing mass fraction of ZrO_2.The fusion depth after welding with ZrO_2 was more than 2 times larger than that after welding without ZrO_2.The weld obtained by welding with 0.50 wt%ZrO_2 possessed a microstructure of austenite and fewδferrite,and the austenite grains in some regions were equiaxed.The addition of a small amount of ZrO_2 decreased hardness and yield strength in bending of the weld zone.With increasing mass fraction of ZrO_2,the hardness of the weld zone decreased,the yield strength in bending decreased first and then increased,the thermal conductivity decreased and the specific heat capacity increased.
引文
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[3]TSENG K H,HSU C Y.Performance of activated TIGprocess in austenitic stainless steel welds[J].Journal of Materials Processing Technology,2011,211(3):503-512.
[4]尹燕,他进国,王占冲,等.光纤激光辅助TIG焊焊缝成形特点及影响因素分析[J].焊接学报,2014,35(8):13-17.
[5]尹燕,王占冲,张瑞华,等.低碳钢激光预熔活性焊接法[J].焊接学报,2014,35(12):39-43.
[6]张兆栋,刘黎明,沈勇,等.镁合金的活性电弧焊接[J].中国有色金属学报,2005,15(6):912-916.
[7]HSIEH R I,PAN Y T,LIOU H Y.The study of minorelements and shielding gas on penetration in TIG welding of Type 304 stainless steel[J].Journal of Materials Engineering and Performance,1999,8(1):68-74.
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