Cylinder Tube Friction Welding for Inspectable Solid Joint Interfaces
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Solution Overview
Problem
Existing methods for manufacturing joined bodies using friction welding face challenges in quality inspection, particularly when hollow portions are present, as they can be misinterpreted as defects during nondestructive testing, making it difficult to perform effective quality control.
Innovation Solution
A manufacturing method involving friction welding between a first member with a hollow portion and a second member with a projecting portion and a flange, where the flange portion is heated by friction heat to fill the clearance and form a solid joint interface, preventing the hollow portion from being recognized as a defect during quality inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If friction welding is performed with hollow portions in joining members, then the joining process can be completed, but the hollow portion is misrecognized as a defect in nondestructive quality inspection
Solution Approach 1:
The hollow portion is filled with filler material before the friction welding process begins. This preliminary action ensures that when nondestructive inspection is performed after welding, the inspection system detects a solid structure rather than a hollow void, eliminating false defect indications while the filler material also serves as a reservoir for weld metal during the welding process
2Measurement precision
If the hollow portion is filled completely, then quality inspection becomes easier, but the manufacturing complexity increases
Solution Approach 1:
The filler material serves multiple functions simultaneously: it fills the hollow portion to enable proper nondestructive inspection, acts as a heat sink to control thermal gradients during welding, provides a reservoir for weld metal, and prevents void formation. This multi-functionality eliminates the need for separate processes to address each of these requirements, reducing overall manufacturing complexity despite the initial filling step
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for easier quality inspection by ensuring the joint interface forms a solid structure, preventing the hollow portion from being misinterpreted as a defect and enhancing the reliability of the joined body.
Implementation Method 1
heating the non-contact portion with friction heat generated by relative rotation between the first member and the second member
Implementation Method 2
the non-contact portion of the flange portion of the second member facing the clearance is joined to the first member by heating the non-contact portion
Data Source
AI summary
A manufacturing method for manufacturing a cylinder tube includes a joining step of joining a tube main body and a head member by friction welding by abutting an end surface of the tube main body and a flange portion of the head member in a state in which a through hole of the tube main body and a projecting portion of the head member are fitted to each other so as to form a predetermined clearance. In the joining step, a non-contact portion of the flange portion of the head member facing the clearance is joined to the tube main body by heating the non-contact portion with friction heat generated by relative rotation between the tube main body and the head member.