首页|局部干法水下快频脉冲MIG焊电源研制

局部干法水下快频脉冲MIG焊电源研制

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针对复杂水下环境焊接过程对焊接电源超高动特性与精确控制需求,设计基于SiC模块的快频脉冲焊接电源功率主电路,开发全数字化控制系统,研制出局部干法水下快频脉冲MIG焊电源(local dry underwater fast-frequency pulsed MIG,LDU-FFPMIG).研制的LDU-FFPMIG焊接电源额定输出电流为 400 A,能精确输出多种 0～30 kHz的快频脉冲电流波形,快频脉冲电流幅值高达 200 A.提出LDU-FFPMIG焊接新工艺,将快频脉冲应用到304不锈钢局部干法水下MIG焊接,探究快频脉冲对传统局部干法水下脉冲MIG焊的影响.结果表明,研制的LDU-FFPMIG焊接电源能够实现稳定的局部干法水下MIG焊,可获得良好的焊缝成形;快频脉冲电流的引入可显著提高电弧能量密度和焊接稳定性,减小熔宽(B)、增大熔深(H),焊缝成形系数(B/H)减小约 30%,并且可以细化晶粒.
Research on local dry underwater fast-frequency pulsed MIG welding power supply
Aiming at the ultra-high dynamic characteristics and precise control requirements of welding power supply in the extremely complex underwater environment,the main cir-cuit of fast-frequency pulsed welding power supply based on SiC module is designed,an all-digital control system is de-veloped,and the local dry underwater fast-frequency pulsed MIG(LDU-FFPMIG)welding power supply is exploited.The welding power supply has a rated output current of 400 A,which can accurately output fast-frequency pulsed current waveforms with the fast-frequency frequency of 0～30 kHz and the fast-frequency current amplitude of 200 A.A new LDU-FFPMIG process is proposed,and the fast-frequency pulsed is applied to perform 304 stainless steel local dry underwater MIG welding,the influence of fast-frequency pulsed on local dry underwater pulsed MIG welding is revealed.The results show that the self-developed LDU-FFPMIG welding power supply achieves stable local dry underwater MIG welding and good weld formation.The introduction of fast-frequency pulsed current significantly improves arc energy density and arc stability,reduces the melting width(B),increases the penet-ration depth(H),reduces the weld forming coefficient(B/H)by about 30%,and refines the grain.

welding power supplySiC moduleall-digital control fast-frequency pulsed waveformlocal dry underwater MIG welding

王振民、贾建军、胡健良、廖海鹏、吴健文、张芩

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华南理工大学,机械与汽车工程学院,广州,510641

华南理工大学,计算机科学工程学院,广州,510006

焊接电源 SiC模块 全数字化快频脉冲波形 局部干法水下MIG焊

国家自然科学基金广东省科技计划广东省科技计划广东省海洋经济发展(海洋六大产业)专项深圳市技术攻关项目

U21412162021B15154200062021B1515120026GDNRC[2021]46号JSGG20201201100400001

2024

10.12073/j.hjxb.20230620002

焊接学报
中国机械工程学会　中国机械工程学会焊接学会　机械科学研究院哈尔滨焊接研究所

焊接学报

CSTPCD北大核心
影响因子：0.815
ISSN：0253-360X
年,卷(期)：2024.45(4)
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