Joining method
A joining method using heat fusion includes layering a first joining body and a second joining body having a smaller plane area than the first joining body; and performing heating and pressurization with a heater from a side of the second joining body. The method further includes a resin dam interposed between the second joining body and the heater. The resin dam includes a base body having one of front and back surfaces in contact with the heater and the other of front and back surfaces in contact with the second joining body; and a dam main body extending from a circumferential edge of the base body in a direction away from the base body and having a shape control surface facing a side surface of the second joining body.
1 . A joining method using heat fusion, the joining method comprising:
a first step of layering a first joining body and a second joining body having a smaller plane area than the first joining body; and
a second step of performing heating and pressurization with a heater from a side of the second joining body, wherein
in the second step, a resin dam is interposed between the second joining body and the heater, and
the resin dam includes
a base body having one of front and back surfaces in contact with the heater and the other of front and back surfaces in contact with the second joining body and
a dam main body extending from a circumferential edge of the base body in a direction away from the base body and having a shape control surface facing a side surface of the second joining body,
wherein each of the first joining body and the second joining body is made of a thermoplastic composite material,
the second joining body is heated and melted so as to be heat-fused to the first joining body, and
the resin dam controls a shape of a resin that is extruded from the second joining body.
2 . The joining method according to claim 1 , wherein a resin pool is provided between the shape control surface and the side surface.
3 . The joining method according to claim 1 , wherein the shape control surface is widened toward a direction away from the base body.
4 . The joining method according to claim 1 , wherein the shape control surface is rounded.
5 . The joining method according to claim 1 , wherein
an end portion of the dam main body facing the first joining body is separate from the first joining body, and
a gap occurs between the first joining body and the end portion.