Welding jig, heat dissipation piece, heat dissipation assembly and electronic assembly

The invention discloses a welding jig, a heat dissipation piece, a heat dissipation assembly and an electronic component, and the welding jig comprises a jig seat which is provided with a placement position, a mounting groove and an air inlet hole; the placing position is configured to place a heat transfer piece, and the mounting groove is configured to place a heat dissipation piece; the mounting groove is provided with a longitudinal wall close to the placement position, the longitudinal wall is configured to define an air passing gap with the heat dissipation piece, and the air passing gap is communicated with the air inlet hole; the mounting groove is further provided with a first transverse wall, the first transverse wall is located at the first end of the mounting groove, the first transverse wall is configured to define a first exhaust gap with the heat dissipation piece, and the first exhaust gap communicates with the external space and the air passing gap. When the heat transfer part and the heat di