建筑镀锌钢板的焊接接头组织与性能研究
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摘要
采用电阻点焊的方法对建筑镀锌钢板进行了焊接处理,研究了不同焊接电流条件下焊接接头力学性能和熔核区显微形貌,并分析了电流强度对镀锌钢板组织与性能的影响。结果表明,镀锌钢板基材由亮白色的马氏体和灰色的铁素体组成,岛状马氏体均匀分布在铁素体基体上;当焊接电流从8.5 kA增加至12.0 kA时,镀锌钢板焊接接头熔核区中未见焊接缺陷的存在,但是焊接电流的增加使得熔核中的柱状晶有逐渐变粗的趋势,熔核中心区域的晶粒在一定程度上得到粗化;随着焊接电流的增加,镀锌钢板的拉剪力和熔核直径呈现先增加而后降低的趋势,在焊接电流为10.5 kA时取得最大值。
The welding process of galvanized steel plate was carried out using the method of resistance spot welding, the microstructure and mechanical properties of nugget zones of welded joints from different welding currents studied, and the effects of current intensity on the performance and microstructure of galvanized steel plate analyzed. The results show that the galvanized steel substrate is composed of bright white martensite and grey ferrite, and that martensite islands are uniformly distributed in the ferrite matrix; When the welding current increases from 8.5 kA to 12.0 kA, the nugget zone has no welding defects, but the increasing of the welding current makes columnar grains in the nugget becoming thicker, and grains in nugget center has been coarsened; With the increasing of welding current, tensile shear and nugget diameter of galvanized steel increase to the maxium when the carrent is 10.5 kA and then decrease.
The welding process of galvanized steel plate was carried out using the method of resistance spot welding, the microstructure and mechanical properties of nugget zones of welded joints from different welding currents studied, and the effects of current intensity on the performance and microstructure of galvanized steel plate analyzed. The results show that the galvanized steel substrate is composed of bright white martensite and grey ferrite, and that martensite islands are uniformly distributed in the ferrite matrix; When the welding current increases from 8.5 kA to 12.0 kA, the nugget zone has no welding defects, but the increasing of the welding current makes columnar grains in the nugget becoming thicker, and grains in nugget center has been coarsened; With the increasing of welding current, tensile shear and nugget diameter of galvanized steel increase to the maxium when the carrent is 10.5 kA and then decrease.
引文
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[3] 蒋贤海,谌小平.焊接速度对高强镀锌钢板激光焊接头组织和性能的影响[J].热加工工艺,2015,44(15):185—187.
[4] 贾松青,张永强,刘兴全.热镀锌TRIP钢点焊焊接裂纹分析[J].电焊机,2015,45(8):145—149.
[5] 陈立伟,姜秋月,于燕.镀锌钢板激光焊焊接接头组织与性能[J].热加工工艺,2016,45(15):222—224.
[6] 李旭.镀锌钢板的激光焊接工艺研究[J].焊接技术,2016,45(1):49—51.
[7] POURANVARI M,MARASHI S P H,MOUSAVIZADEH S M.Dissimilar resistance spot welding of DP600 dual phase and AISI 1008 low carbon steels:correlation between weld microstructure and mechanical properties[J].Ironmaking & Steelmaking,2011,38(6):471—480.