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PRCI PR-185-920
- Investigation of WIC Test Variables
- Report / Survey by Pipeline Research Council International, 02/01/1991
- Publisher: PRCI
$125.00$249.00
L51633e
Edison Welding Institute
Need: The Welding Institute of Canada (WIC) has developed a test for pipelines which determine threshold preheat levels necessary to avoid hydrogen cracking in the root region of circumferential welds. This test is simple to perform, reproducible and reasonably inexpensive. Experience has shown, however, that preheat levels determined by the WIC test are typically higher than normally required to achieve, sound, crack-free welds in the field.
Benefit: Consequently, there is a need to characterize the WIC test in more detail even though significant work was performed by other researchers. Through further characterization, pipeline operators will be able to formulate safe and economical welding procedures with more accurate preheat levels. The following report describes the experimental approach, the processes used for analysis, the results, the conclusions drawn and the recommendations for future work.
Result: In the present program, it was anticipated that comparison of single- versus double-pass WIC tests, high versus low strength electrodes and restraint considerations would allow a more complete understanding of WIC test variables and their influence on the reproducibility of the test. Although in principle this is proper line-of-thought for developing a better understanding of a weldability test, the scope of the program was too broad and, therefore, not sensitive to determining the exact influence each variable has on the test. Nevertheless, this program has provided some base-line information about the test.
Edison Welding Institute
Need: The Welding Institute of Canada (WIC) has developed a test for pipelines which determine threshold preheat levels necessary to avoid hydrogen cracking in the root region of circumferential welds. This test is simple to perform, reproducible and reasonably inexpensive. Experience has shown, however, that preheat levels determined by the WIC test are typically higher than normally required to achieve, sound, crack-free welds in the field.
Benefit: Consequently, there is a need to characterize the WIC test in more detail even though significant work was performed by other researchers. Through further characterization, pipeline operators will be able to formulate safe and economical welding procedures with more accurate preheat levels. The following report describes the experimental approach, the processes used for analysis, the results, the conclusions drawn and the recommendations for future work.
Result: In the present program, it was anticipated that comparison of single- versus double-pass WIC tests, high versus low strength electrodes and restraint considerations would allow a more complete understanding of WIC test variables and their influence on the reproducibility of the test. Although in principle this is proper line-of-thought for developing a better understanding of a weldability test, the scope of the program was too broad and, therefore, not sensitive to determining the exact influence each variable has on the test. Nevertheless, this program has provided some base-line information about the test.
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