AWS G1.10M:2016 pdf download.Guide for the Evaluation of Thermoplastic Welds
flow fusion welding. A variety of beadless welding techniques in which resultant joints are free from internal and external beads and crevices. The primary method of beadless welding involves careful diffusion of heat through the extermal surfaces while maintaining internal support of material as it becomes molten. The Welding Procedure Specification (WPS) specifies the heating temperature and heating cycle during which the molten material readily joins as a single piece.heated tool butt welding (HT). A method for joining the ends of thermoplastic pipe or fittings in which a hot tool is placed between the pipe ends for a predetermined heating time and then the ends are pushed together with a predetermined amount of force until the joint cools.
7. Testing and Evaluation
Visual inspection, measurements and, where necessary, suitable non-destructive or destructive testing procedures should be used to verify that the acceptance criteria for the individual welding groups have been met. Testing can be carried out on the welded joints of the component. Specific characteristics can also be verified on test pieces that are fabricated under comparable conditions. The nature and extent of the tests, together with their timing, should be agreed upon between the customer and the fabricator. The test results should be documented.
7.1 Evaluation. The test results form the basis for the classification of welded joints into one of the three evaluation groups by welding process, in accordance with Annexes G through L. Annexes A through F define imperfections in weld joints,and should be used in the evaluation and documentation process. The test reports should be used to determine points where the results do not correspond with the acceptance criteria. Should the component, or individual welded joints, not correspond to the evaluation group specified (4.1), then it or they should be reworked or replaced.
7.2 Reworking Defective Welded Joints. When allowed under the contract and insofar as possible, defective welded joints should be reworked or replaced. The purpose of reworking operations is to obtain the welded joint quality established by the acceptance criteria. If necessary, the results should be determined by additional testing.
7.3 Overlapping Flaws. Should two or more types of flaw arise simultaneously on welded joints, the cumulative effect of the individual flaw can result in more than the sum of the individual flaws. Tests should then be carried out to ascer-tain whether the welded joint still meets the acceptance criteria established or whether restrictions have to be imposed as regards safety and quality standards because of the accumulation of flaws.AWS G1.10M pdf download.