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Theroy of Butt Fusion
Date:2013-11-16
Butt fusion welding machine, to heat two surfaces to a designated temperature, and then fuse them together by application of force. This pressure causes flow of the melted materials, which causes mixing and thus fusion. When the polyethylene material is heated, the molecular structure is transformed from a crystalline state into an amorphous condition. When fusion pressure is applied, the molecules from each polyethylene part mix. As the joint cools, the molecules return to their crystalline form, the original interfaces are gone, and the fitting and pipe have become one homogeneous unit. The joint area becomes as strong as the pipe itself in both tensile and pressure conditions.
Firmly seat the socket fitting on the male adapter of the heater. Place the female adapter of the heater over the end of the pipe, firmly against the cold ring clamp. Heating time starts when the heater is bottomed out on the cold ring clamp. Heat fitting and pipe for the pipe manufacturer’s specified period of time by using the butt fusion welding machine.
After completing the pipe manufacturer’s specified cooling time, remove the butt fusion welding machine cold ring clamp and the socket fitting holder. Inspect the joint. A good joint will have a uniform melt ring that is flat against the socket fitting and perpendicular to the pipe. There should be no gaps or voids between the fitting and the pipe.
Be careful for following points when welding use butt fusion welding machine:
The area of pipe that the fitting will come in contact with must be cleaned.
The fitting must be properly seated on the pipe for proper alignment.
A melt pattern must be formed that penetrates into the pipe and into the fitting.
The pipe and fitting must be joined and the pipe fully seated within the fitting.
The molten joint must be held immobile until adequately cooled.
Visually examine the entire circumference of the joint for compliance with standards established by your company, customer, industry, federal, state, or local regulations.
After welding, must clean the butt fusion welding machine and theTrimmer.
Source: http://www.zjbuttfusion.com, the manufacturer of butt fusion welding machine in China