In order to further reduce the spatter generated during cold metal transfer (CMT), the characteristics of CMT lap welding process of thin galvanized sheet were studied and analyzed for automotive thin galvanized sheet materials. Baumer HX 13 industrial high-speed camera was used to capture the CMT welding droplet transition images, and the CMT welding current and voltage signals were collected using NI PXI data acquisition system. The influence of current and voltage on the droplet transfer of CMT in the early stage and late stage of short circuit is mainly studied, and the influence of welding gun inclination on the droplet transfer behaviour of CMT lap welding of thin galvanized sheet was analysed. The results show that when the current in the short-circuit stage of CMT is less than the base stage current, there is no disturbance in the current and voltage waveform, and the welding process is stable. When the current at the later stage of short circuit is reduced by about 5 A, the spatter generated by the CMT lap can be effectively reduced. A smooth droplet transition can be obtained with minimum welding spatter, maximum weld depth of fusion and best weld formation when the torch is at an angle of 30° to the vertical plane. Therefore, when the short-circuit phase current is less than the base stage current and the short-circuit current is reduced by about 5 A, the welding process with 30° welding gun inclination can achieve less metal splash, providing a theoretical basis for production practice.
HAN Yongquan
,
LIU Lele
,
SUN Zhenbang
,
SHI Lei
,
DU Maohua
. Characteristics of CMT lap joint process for thin galvanized sheet for vehicles[J]. Transactions of The China Welding Institution, 2023
, 44(2)
: 90
-95
.
DOI: 10.12073/j.hjxb.20220325003
[1] Zhou S, Zhao Y, Peng Z, et al. The investigation of laser lap welding process on high-strength galvanized steel sheets[J]. ISRN Mechanical Engineering, 2011, 2011: 923964.
[2] 李超豪, 华学明, 张跃龙, 等. 镀锌板CMT焊焊缝气孔影响因素及产生机理[J]. 焊接学报, 2019, 40(1): 94-98,103
Li Chaohao, Hua Xueming, Zhang Yuelong, et al. Influencing factors and mechanism of porosity in CMT welding of galvanized sheet[J]. Transactions of the China Welding Institution, 2019, 40(1): 94-98,103
[3] Pang J, Hu S, Shen J, et al. Arc characteristics and metal transfer behavior of CMT plus P welding process[J]. Journal of Materials Processing Technology, 2016, 238: 212-217.
[4] 黄瀚川, 徐连勇, 荆洪阳, 等. SAF2507超级双相不锈钢CMT + P熔滴过渡特性[J]. 焊接学报, 2019, 40(10): 127-136,167
Huang Hanchuan, Xu Lianyong, Jing Hongyang, et al. Droplet transfer characteristics of SAF2507 super duplex stainless steel CMT + P[J]. Transactions of the China Welding Institution, 2019, 40(10): 127-136,167
[5] 赵双双, 梁志敏, 汪殿龙, 等. 铝合金DC CMT与P-MIG混合过渡焊特征分析[J]. 焊接技术, 2015, 44(1): 26-29
Zhao Shuangshuang, Liang Zhimin, Wang Dianlong, et al. Characteristic analysis of hybrid transition welding of aluminum alloy DC CMT and P-MIG[J]. Welding Technology, 2015, 44(1): 26-29
[6] Pickin C G, Williams S W, Lunt M. Characterization of the cold metal transfer (CMT) process and its application for low dilution cladding[J]. Journal of Materials Processing Technology, 2011, 211(3): 496-502.
[7] 汪殿龙, 张志洋, 梁志敏, 等. 交流CMT动态电弧特征及熔滴过渡行为分析[J]. 焊接学报, 2014, 35(3): 6-10,113
Wang Dianlong, Zhang Zhiyang, Liang Zhimin, et al. Analysis of dynamic arc characteristics and droplet transfer behavior of AC CMT[J]. Transactions of the China Welding Institution, 2014, 35(3): 6-10,113
[8] 王志平, 靳朋礼, 杨斯楠, 等. 镀锌层厚度对铝/镀锌板CMT搭接接头组织和性能的影响[J]. 焊接学报, 2019, 40(4): 16-21,161
Wang Zhiping, Jin Pengli, Yang Sinan, et al. Effect of zinc coating thickness on microstructure and properties of CMT lap joint of aluminum/galvanized sheet[J]. Transactions of the China Welding Institution, 2019, 40(4): 16-21,161
[9] 于家英, 王华, 郑伟森, 等. 热浸镀锌高强汽车板界面组织对其拉伸断裂行为的影响[J]. 金属学报, 2020, 56(6): 863-873
Yu Jiaying, Wang Hua, Zheng Weisen, et al. Effect of interface structure on tensile fracture behavior of hot-dip galvanized high-strength automobile sheet[J]. Acta Metallurgica Sinica, 2020, 56(6): 863-873
[10] Ola O T, Doern O T. A study of cold metal transfer clads in nickel-base INCONEL 718 superalloy[J]. Materials & Design, 2014, 57: 51-59.
