Induction Fusing the butt joint
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Objective: Fuse elastomer (TPE) tubes together in two ways, as a butt joint and as a overlap joint.
Material: PeBax tubing 3/16” (4.76) OD, 1/8” (3.18 mm) ID and slightly larger
Stainless steel Teflon coated mandrel 1/8” (3.18 mm) diameter
Temperature: 350 ºF (177 ºC)
Frequency: 352 kHz
Equipment • Power of 6kW induction heating system, equipped with a remote workhead containing two (2) .33μF capacitors (for a total of .66 μF).
• Induction heating coils designed and developed specifically for this application.
Process For the butt joint, two tubes of the same diameter with differing degrees of hardness are used. The tubes are slipped onto the Teflon coated mandrel and a short length of shrink tubing is placed over the tubes. Hot air is blown over the shrink tubing to gently heat it. The assembly is placed in the center of a threeturn
pancake coil and heated for 8 seconds. For the overlap joint, the two tubes have different diameters.
The smaller diameter tube is placed over the mandrel first and then the larger diameter tube is slipped over it. A length of shrink tubing is placed over the assembly. Hot air is blown over the shrink tubing to gently heat it. A nine-turn helical coil is used to fuse the complete assembly together.
Results/Benefits Advantages of induction heating are:
• Heating of the mandrel is from the inside out providing a smooth finish on the outside of the assemblies.
• Precise, repeatable application of heat.
• Ambient temperature factors do not affect the process
• No over heating
Fusing the butt joint
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