ELECTRODES FOR RESISTANCE-WELDING

• Main Authors: KOE SHINGO, UENO SHUJI, MISHIMA AKIRA, MORI SHIGEKI
• Format: Patent
• Language: English; Japanese
• Published: 22.01.2015
• Subjects: ALLOYS; CHEMISTRY; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; FERROUS OR NON-FERROUS ALLOYS; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WELDING; WORKING BY LASER BEAM

PROBLEM TO BE SOLVED: To provide electrodes for resistance-welding which enable welding objects to be welded with each other even if the welding objects are made of hard-to-weld materials, thanks to large heat generation of the electrodes themselves due to electric conduction, and which hardly react with the welding objects.SOLUTION: Any of materials comprising 5-95 vol.% of W, and 5-95 vol.% of carbides, nitrides, borides and the like of group 4A to 6A metals, is used on at least surfaces of electrodes for resistance-welding, which contact welding objects, respectively. The materials each have a comparatively high electrical resistivity and bring about a large resistance heating amount when used as the electrode and thus, make it easy to weld even a hard-to-weld material. Further, even if a welding metal is a material easy to cause deposition to the electrode, such as aluminum, magnesium or the like, deposition is hardly caused because of low reactivities of the materials. Besides, since the fracture toughness of W is high, the materials can be used for various shape electrodes. 【課題】被溶接材が難溶接材であっても、通電による自身の発熱が大きさにより溶接が可能で、かつ、被溶接材と反応しにくい抵抗溶接用電極を得る。【解決手段】抵抗溶接用電極の少なくとも非溶接材と接する面に、Ｗを５〜９５体積％と４ａ〜６ａ族金属炭化物、窒化物、ホウ化物等を５〜９５体積％有する材料を用いることで解決した。これらの材料は電気抵抗率が比較的高く、電極として用いた場合に抵抗発熱量が大きく、難溶接材も溶接が容易になる。また、被溶接金属がアルミニウム、マグネシウムなどの電極と溶着が起こりやすい材料であっても、反応性が低いために溶着が起こりにくい。Ｗの破壊靱性が高いために、様々な電極形状に用いることが可能である。【選択図】図１