Standard Historical Last Updated: May 21, 2014
ASTM C1147-01(2012)

Standard Practice for Determining the Short Term Tensile Weld Strength of Chemical-Resistant Thermoplastics

Significance and Use

5.1 The mechanical performance of welded thermoplastic structures is largely dependent on the quality of the welding operation. Fabricators should determine that the proper welding procedures are being followed and that welders maintain their proficiency. Results from this practice are indicative of skill in proper welding procedures for different thermoplastic materials and the use of appropriate welding equipment. If the welded test specimens have short term weld factors that meet or exceed the minimums as set forth in this practice, or as agreed to by supplier and user, it may be concluded that, with the same degree of skill and diligence by the welder, acceptable welds should be obtained in fabricated structures.

Scope

1.1 This practice covers the preparation and evaluation of joints between two pieces of weldable grades of thermoplastic materials, backed and unbacked, (such as those shown in Table 1) up to 2 in. (50 mm) in thickness.

TABLE 1 Typical Guide for Hot Gas Welding Temperatures
Note 1For other welding techniques, consult material and equipment supplier for recommendations.

 

 

°FA

Recommended Gas TypeB

 

HDPE

500–600

 

Nitrogen or Air

 

PP

550–600

 

Nitrogen or Air

 

PVC

500–550

 

Air

 

CPVC

550–660

 

Air

 

PVDF

650–680

 

Nitrogen or Air

 

ECTFE

665–695

 

Nitrogen

 

ETFE

675–710

 

Air

 

FEP

650–725

 

Air

 

PFA

675–750

 

Air

 

MFA

536–554

 

Air

A Measured 1/4 in. inside weld tip, directly in gas stream.
B Inert gas may be used in place of air.

1.2 Since there are numerous new technologies and techniques constantly being developed for plastic welding, there are no profiles and procedures that can be considered as standard for all plastics at various thicknesses. This practice is not intended to define profiles and procedures; however, it is intended to establish methods to evaluate minimum short term weld factors to be achieved by the welder for the respective plastics.

1.3 Weld procedures used for test pieces should reflect procedures to be used in actual fabrication.

1.4 Welding methods to be used could include machine welding, extrusion welding, and hot gas welding.

1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

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Details
Book of Standards Volume: 08.01
Developed by Subcommittee: D20.19
Pages: 4
DOI: 10.1520/C1147-01R12
ICS Code: 83.080.20