发明授权
US06220500B1 Welding method for fluorine-passivated member for welding, fluorine-passivation method after being weld, and welded parts
有权
用于焊接的氟钝化部件的焊接方法,焊接后的氟钝化方法以及焊接部件
- 专利标题: Welding method for fluorine-passivated member for welding, fluorine-passivation method after being weld, and welded parts
- 专利标题(中): 用于焊接的氟钝化部件的焊接方法,焊接后的氟钝化方法以及焊接部件
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申请号: US09130583申请日: 1998-08-07
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公开(公告)号: US06220500B1公开(公告)日: 2001-04-24
- 发明人: Tadahiro Ohmi , Takahisa Nitta , Yasuyuki Shirai , Osamu Nakamura
- 申请人: Tadahiro Ohmi , Takahisa Nitta , Yasuyuki Shirai , Osamu Nakamura
- 优先权: JP9-227121 19970808; JP9-322361 19971107
- 主分类号: B23K120
- IPC分类号: B23K120
摘要:
A welding method for materials to be welded which are subjected to fluoride passivation treatment, and a fluoride passivation retreatment method, wherein, when fluoride passivation retreatment is conducted after welding, there is no generation of particles or dust. The method provides superior resistance to fluorine system gases. During fluoride passivation treatment, hydrogen is added to the gas (the back shield gas) flowing through the materials to be welded. In one embodiment of the welding method, the thickness of the fluoride passivated film in a predetermined range from the butt end surfaces of the materials to be welded is set to 10 nm or less, followed by subsequent welding. Furthermore, the fluoride passivation retreatment method, includes the steps of heating at least the welded parts following welding and flowing a gas containing fluorine gas in the interior portion of the parts.