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Some pigments, such as carbon black, may stain a heating surface and probably cannot be removed; such stains will not contaminate the joint interface. A concave melt surface indicates unacceptable pressure during heating. These procedures are general ones. Plastic left on the tool tends to char when reheated, causing a loss of heater efficiency and joint contamination. This skill and knowledge is obtained by making joints in accordance with proven procedures under the guidance of skilled operators. Cut joints into straps, see Fig. Longer heating cycles are used so that the pipe?

astm d2657

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Active view current version of standard.

Pipe may have a slight toe-in or reduced diameter for several inches at the end of the pipe. The melt should be? This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Tests that have been found useful for this purpose include inside face bend, outside face bend, tensile elongation, torque, and impact.

ASTM D2657 – 07(2015)

Completeness of melt pattern is the key. There is a temperature range within which any particular material is satisfactorily joined. The values given in parentheses are for information only. This device indicates the internal temperature of the heating iron which is astmm higher than temperature of the fusion surfaces.



It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Do not apply internal pressure until the joint and surrounding material have reached ambient air temperature. If too little force is used, only the melt in the beads may be fused together and, as the molten material in the joint cools and contracts, voids or non-fused areas may be formed.

These procedures should be regarded as general ones.

Some materials are more adaptable to one technique wstm another. In such cases, visual evaluation is based mainly on the size and shape of the pipe-side bead. A clean, dry piece of wood is used to push the heating tool against the pipe. Clean dust and particles from the roughened surfaces afterwards by wiping with a clean, dry, oil-free, lint-free cloth.

astm d2657

Bending, peeling, and elongation tests are useful for this purpose. Alignment jigs provide a means to mount the alignment jig on the pipe, hold the? When the bead touches the pipe surface, stop moving the component ends together, but do not release the force.

Some materials are more adaptable to one technique than another. The beads should be uniformly shaped and sized all around the joint.


These notes and footnotes excluding those in tables and? Pipes shall be aligned before the alignment clamp is closed; however, do not force the pipe into alignment by pushing it against the side of an open alignment jig clamp. Use this heating cycle for fusions during prevailing conditions.

See Practice F for heat fusion joining of polyethylene pipe and fittings. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

The hydraulic fusion machine gauge pressure setting may need to be increased to overcome internal machine friction drag or to provide additional force to move pipes attached to the butt fusion machine.

astm d2657

Procedure 2—Butt Fusion 8. Quickly inspect the melted surfaces per 8. Keep the heater dry at all times.

If the softened material sticks to the heater plate, discontinue the joining procedure. The melts from the two components? Current edition approved Aug. Do not use synthetic fabrics which may char and stick to the fusion surface. Plastic materials may stick to hot metal heating surfaces. Astk procedures are general ones.

astm d2657