Patent ID: 11530057

Abstract:
A double-headed tube structure and a double-headed tube structure are disclosed. The method includes the steps: a first tube head being sealedly welded to a first end portion of a tube body using a first mold, and then the first mold being removed; a second mold being inserted through the first tube head to a second end portion the tube body, the second end portion, an annular retaining member and a second tube head being sealedly welded together, and then the second mold being removed. The structure is that the second tube head is sealdedly welded to the tube body through the annular retaining member. The first and second tube heads are sealedly welded at both ends of the tube body by a two-step forming process. Through the annular retaining member, the tube body is not deformed in the two-step forming process, thereby improving the welding and sealing effect.