PRODUCTION METHOD FOR WELDED BODY AND PRODUCTION METHOD FOR GAS SENSOR

摘要

In a main metal piece 60 and an inner cylinder 70 serving as cylindrical bodies before welding, a second end surface 75 is an inclined surface that inclines toward an end portion opposite from the second end surface 75 as the second end surface 75 extends toward the center axis, and an angle θ2a is 5° to 15°. Thus, the distance between a first end surface 65 and the second end surface 75 positioned in resistance welding increases toward the center axis, and an angle θc (=angle θ2a) between the first end surface 65 and the second end surface 75 is 5° to 15°.

主权项

1. A production method for a welded body in which a first cylindrical body and a second cylindrical body formed of metal are coaxially welded, the production method comprising:
(a) a step of preparing the first cylindrical body and the second cylindrical body; (b) a step of coaxially positioning the first cylindrical body and the second cylindrical body to bring into contact with each other while opposing a first end surface serving as an end surface of the first cylindrical body in an axial direction to a second end surface serving as an end surface of the second cylindrical body in the axial direction; and (c) a step of resistance-welding the first end surface and the second end surface to produce the welded body by energizing a contact portion between the first cylindrical body and the second cylindrical body in a state in which the first cylindrical body and the second cylindrical body are pressed in directions to approach each other, wherein, in the first cylindrical body and the second cylindrical body prepared in the step (a), at least one of the first end surface and the second end surface is an inclined surface that inclines toward an end portion opposite from the one end surface as the one end surface extends toward a center axis, and the inclined surface inclines so that a distance between the first end surface and the second end surface positioned in the step (b) increases toward the center axis and so that an angle θc between the first end surface and the second end surface is 5° to 15°.