Stainless steel and copper joined body, method of producing same, and stainless steel and copper joining method

A stainless steel and copper joining method, wherein overlapping stainless steel and copper materials to be joined are joined by fillet welding,

• the fillet welding is TIG welding,
• the TIG welding comprises
• positioning an electrode at a copper side of the overlapping portion of the materials to be joined, and performing multiple heat inputs under conditions satisfying (a) to (e) below,
• (a) a tilt angle α of the electrode in a perpendicular-to-welding direction:
• −10° to +60°
• here, the thickness direction of the materials to be joined is the reference angle (0°), and a side where a leading end of the electrode is pointed towards the copper side is +ve and a side where the leading end of the electrode is pointed towards the stainless steel side is −ve,
• (b) electrode height:
• more than 0 mm and 3.0 mm or less
• (c) each heat input position in the perpendicular-to-welding direction:
• 0 to +6×t (mm)
• here, t is the copper thickness (mm), an end of the copper at the surface of the overlapping portion is the reference position (0), the copper side is +ve and the stainless steel side is −ve,
• (d) distance interval in the welding direction between each heat input point:
• 20% or more to 90% or less of a diameter Dk−1 (mm) of a welding point formed by the immediately preceding heat input,
• (e) time interval between each heat input:
• 20% or more of the welding time (s) of the immediately preceding heat input,
• and further, at each heat input, welding current I (A), welding time d (s), and the copper thickness t (mm) satisfy the relationship of the following Formula (3):
• 500
• ≤
• I
• 1.5
• ×
• d
• 0.5
• ×
• t
• -
• 1
• ≤
• 3500.
• (
• 3
• )