高频脉冲变极性焊接工艺性能研究  

Technology properties of variable polarity arc welding with high frequency pulsed current

作　　者：邱灵[1] 杨春利[1] 林三宝[1] 

机构地区：[1]哈尔滨工业大学现代焊接生产技术国家重点试验室,150001

出　　处：《焊接》2007年第7期35-38,共4页Welding & Joining

摘　　要：分析了高频脉冲电流对变极性焊接电弧特性、焊接工艺及焊缝性能的影响,试验结果表明,高频电流脉冲能够较大程度地压缩电弧等离子体、提高电弧轴向压力及电弧挺度,在相同焊接电流有效值的情况下,频率在5kHz以上的电流脉冲能将电弧力提高到普通变极性焊接的260%左右。同时高频脉冲电流能够提高变极性焊接的焊缝熔深,减小焊缝正面余高以及改善焊接效率。对于2219-T6时效强化铝合金而言,采用叠加10kHz高频脉冲变极性焊接工艺,焊缝抗拉强度在未经任何焊后热处理的情况下能够达到300MPa左右,相当于母材强度的67%。Effect of high frequency pulse current on arc properties, welding technology and mechanical properties of welded joint in variable polarity arc welding were investigated. The experimental results indicated that the increased frequency of the pulsed current significantly contributed to increase arc pressure and arc stiffness under the same mean welding current. When the pulse frequency is higher than 5 kHz, the arc pressure can be reinforced to 260 % that of the general variable polarity arc welding. Moreover, weld penetration, excess weld metal and welding efficiency are also related to the frequency of pulsed current. The maximum tensile strength of welded joints of 2219-T6 aluminum alloy obtained at pulse frequency of 10 kHz is 300 MPa, which is equivalent to 67 % that of base materials.

关 键 词：变极性焊接 高频脉冲焊接 电弧力 抗拉强度 

分 类 号：TG422.3[金属学及工艺—焊接]