Test method of tensile for plastics welded test specimen
1 Scope
This standard specifies the terms and definitions, symbols and descriptions, test principles, test devices, test sample preparation, state adjustment, test methods, test results and test reports by the test method of tensile for plastics welded specimen.
This standard is applicable to tensile testing for thermoplastic samples in hot-gas welding, extrusion welding, hot fusion welding, electrofusion welding and other welding procedures.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 2035 Terms and definitions for plastics
GB/T 2918-1998 Plastics — Standard atmospheres for conditioning and testing
GB/T 3375 Welding terminology
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 11997 Plastic — multipurpose test specimens
GB/T 17200 Technical specification for tensile, compression and flexural testing machines for rubber and plastics (constant rate of traverse)
ISO 2602:1980 Statistical interpretation of test results — estimation of the mean — confidence interval
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 2035 and GB/T 3375 and the following apply.
3.1
welding beads
plastic melt overflowing from the edge of weld in welding
3.2
test sample
samples for welding procedure qualification test, made according to the requirements of technical standards; a local sample taken from the test piece, including base metal and welded joint
Note: Test samples can be called test shims (such as dumbbell-shaped test shim for tensile test) depending on different shapes of test sample, and test pipes (such as welding pipes for full cross-section tensile).
4 Symbols and interpretations
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and interpretations
5 Test principle
6 Test device
6.1 Testing machine
6.2 Instrument for measuring the width and thickness of test sample
6.3 Sample preparation machine and milling cutter
7 Test sample preparation
7.1 Sampling requirements
7.2 Test sample shape
7.3 Test sample dimensions
7.4 Test sample preparation method
7.5 Number of test samples
8 Conditioning
9 Test methods
9.1 Test environment
9.2 Measurement of test sample
9.3 Installation of test sample
9.4 Tensile speed of test sample
9.5 Data record
10 Test results
10.1 Tensile strength
10.2 Statistical analysis parameters
10.3 Significant digits
10.4 Test result processing
11 Test report
Annex A (Informative) Test report format
Figure 1 Rectangular test samples of plates and pipes for tensile test
Figure 2 Dumbbell-shaped test samples of plates and pipes for tensile test
Figure 3 Schematic diagram of pipe sampling
Table 1 Symbols and interpretations
Table 2 Dimensions of rectangular test sample
Table 3 Dimensions of dumbbell-shaped test sample
Table 4 Tensile speed of test sample of primary plastic material
Table A.1 Tensile test report for plastics welded test sample
