Method for manufacturing joint structure of dissimilar materials, and joint structure of dissimilar materials

A joint structure of dissimilar materials comprising:

• a non-ferrous metal part and a steel material joined to each other;
• and
• a low-temperature thermal spray coating formed on at least a part of a surface of the non-ferrous metal part by low-temperature spraying a metal powder containing at least one selected from pure iron, carbon steel, stainless steel, nickel, a nickel alloy, cobalt, and a cobalt alloy, wherein
• the non-ferrous metal part and the steel material are overlapped such that the low-temperature thermal spray coating and the steel material face each other,
• a weld metal is formed on a surface of the steel material, the surface being on a side opposite to the non-ferrous metal part, to join the steel material and the low-temperature thermal spray coating, and
• a hydrogen content in the low-temperature thermal spray coating is 16 ppm or less.

A joint structure of dissimilar materials comprising:

• a non-ferrous metal part and a steel material joined to each other;
• and
• a low-temperature thermal spray coating formed on at least a part of a surface of the non-ferrous metal part by low-temperature spraying a metal powder containing at least one selected from pure iron, carbon steel, stainless steel, nickel, a nickel alloy, cobalt, and a cobalt alloy, wherein
• the non-ferrous metal part and the steel material are overlapped such that the low-temperature thermal spray coating and the steel material face each other,
• a weld metal is formed on a surface of the steel material, the surface being on a side opposite to the non-ferrous metal part, to join the steel material and the low-temperature thermal spray coating, and
• the low-temperature thermal spray coating is made of at least one type of powder selected from a gas atomized powder, a disk atomized powder, a plasma atomized powder, and a powder manufactured by using a plasma rotating electrode method.