Abstract
Summary This paper describes an investigation of the effects of the friction welding conditions on the joining phenomena and tensile strength of welded joints produced from polyethylene gas supply pipes in tests conducted on a metal brake-type friction welding machine. The results obtained may be summarised as follows: 1. The friction pressure strongly affects the initial torque and total loss (burn-off) in such a way that the initial torque and total loss sharply increase with an increasing friction pressure. 2. The initial torque and upset pressure found during friction welding of polyethylene pipes are much lower than those found during friction welding of metals. 3. The friction pressure strongly affects the flash size on the outside and inside of the pipes in such a way that the flash size (height of flash and width of flash) sharply increase with an increasing friction pressure. 4. The friction pressure and rotational speed strongly affect the appearance of the friction-welded joints. 5. The tensile strength and elongation at fracture of sound friction-welded joints are equivalent to those of base polyethylene pipes.
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