| 摘要 |
PROBLEM TO BE SOLVED: To improve the structure of the part, where a sub-component made of non-weldable material is joined to a tank body made of weldable material, so that the ill-fitted state of the part caused by degradation by aging or swelling can be made difficult to occur. SOLUTION: The sub-component made of non-weldable material (a valve body 4 shown in EMBODIMENT) is joined to an opening (a fitting hole 3 shown in EMBODIMENT) provided on a synthetic-resin-made tank body (2) made of weldable material to make a joint structure, wherein a flange (6) is provided on the sub-component, the flange being in contact with the rim of the opening, and a supporting member (supporting body 5 shown in EMBODI MENT) for covering the flange is made of weldable material, so that the supporting member is welded to the tank body while the flange is sandwiched between the supporting member and the tank body. Thus, the tank body and the supporting member are firmly welded together while having the flange in between, so that the sub-component is joined to the tank body.
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