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公开(公告)号：US20180050417A1
公开(公告)日：2018-02-22
申请号：US15552880
申请日：2016-02-22
发明人： Keishi SETODA , Yosuke HIRUMA , Yusuke MURAMATSU
CPC分类号： B23K10/02 , B23K9/0026 , B23K9/095 , B23K9/173 , B23K10/00 , B23K10/027 , B23K31/00 , B23K2103/04
摘要： A penetration welding method includes a plasma welding step for forming a through hole in a work, which is a laminated steel plate, from a front surface to rear surface thereof without forming a hole in a component at the rear, by generating a plasma arc column from a plasma torch to the work. After the plasma arc column is generated, the plasma arc column is extinguished when an arc voltage or the length of the arc estimated from the arc voltage exceeds an end-determining threshold which is determined according to the thickness of the work. Further, plasma gas is discharged from the plasma torch at a flow rate at which the width of the plasma arc column is maintained approximately constant from the plasma torch side to the work side so that the arc voltage is increased at an approximately constant rate before and after penetration.
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公开(公告)号：US20180001414A1
公开(公告)日：2018-01-04
申请号：US15546144
申请日：2016-01-22
发明人： Yosuke HIRUMA , Keishi SETODA , Yusuke MURAMATSU
CPC分类号： B23K10/00 , B23K9/173 , B23K9/325 , B23K10/02 , B23K2101/006 , B23K2101/18 , H05H1/32
摘要： A plasma ejection unit (21) of an arc welding device includes a plasma torch (26), a copper plate (27), a container (28), and a gas supplying unit (29). Plasma gas inside the container (28) is pressurized by argon gas supplied from the gas supplying unit (29), and ejected from first to eighth ejection ports. The plasma gas ejected from the first to eighth ejection ports is concentrated in a concentration area (CA) between vehicle body plates (16-17) to form through holes (40) in the vehicle body plates (16-17), and is separated. The air pressures, in eight areas, of the plasma gas reaching a vehicle body plate (18) are approximately one-eighth of the air pressure of the plasma gas in the concentration area (CA). Accordingly, while the through holes (40) are formed in the vehicle body plates (16-17), no through hole is formed in the vehicle body plate (18).
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