AWS G1.10M:2016 pdf download

AWS G1.10M:2016 pdf download.Guide for the Evaluation of Thermoplastic Welds
1. Scope, Purpose, and Range of Application
1.1 These guidelines list and describe defects and faws in welded joints in thermoplastic materials. The objective is to make possible a generally valid evaluation giving con sideration to graded quality requirements. This guide is meant to aid those responsible for the evaluation of thermoplastic welds. The fnal determination of what is an acceptable weld should be the responsibility of the engineer, owner or user. 1.2 By classifcation into one of the evaluation groups in 4.1, specifc faws may be excluded or kept within limits when welded joints are produced. 1.3 The application of these guidelines and the measures through which they can be met should be included in con tractual specifcation or form part of the generally recog nized specifcations. 1.4 Welding Processes. Defects and faws produced by the follow ing welding processes are addressed. This guide applies to the following processes:1.6 The use of these guidelines for welding other thermo plastic materials should be agreed upon between the cus tomer and the fabricator. 1.7 This standard makes use of the International System of Units (SI). 1.8 Safety and health issues and concerns are beyond the scope of this standard and therefore are not addressed herein. Safety and health information is available from the following sources: American Welding Society: (1) ANSI Z49.1, Safety in Welding, Cutting, and Allied Processes (2) AWS Safety and Health Fact Sheets (3) Other safety and health information on the AWS website Material or Equipment Manufacturers: (1) Safety Data Sheets supplied by materials manufacturers (2) Operating Manuals supplied by equipment manufacturers Applicable Regulatory Agencies Work performed in accordance with this standard may involve the use of materials that have been deemed hazardous, and may involve operations or equipment that may cause injury or death. This standard does not purport to address all safety and health risks that may be encountered. The user of this standard should establish an appropriate safety program to address such risks as well as to meet applicable regulatory requirements. ANSI Z49.1 should be considered when developing the safety program.
3. Defnitions
The terms used in this specifcation are defned in ASTM C 904, Terminology Relating to Chemical-Resis tant Nonmetallic Materials, and AWS A3.0, Standard Welding Terms and Defnitions. Exceptions, within the context of this standard, are listed below with their defnitions. back welding. An addition of a secondary external hot gas or extrusion weld on a socket fusion welded joint, electrofusion welded joint, or solvent cement welded joint. beadless welding. See fow fusion welding. bead-start/stop crack. A crack occurring at the start/stop of a weld due to the thermal characteristics of an over stressed weld rod. Thermoplastic materials exhibit thermal characteristics that contribute to this condition. defect. A faw of a size or confguration exceeding the limitations of the applicable acceptance criteria.electrofusion welding (EFW). A thermoplastic welding process where the heat for welding is provided by energizing an electrically resistive coil in the weld zone. extrusion welding (EX). A joining process in which molten thermoplastic material is forced against preheated workpieces to produce the weld. fan welding (HF). A hot gas welding method where the weld rod is fed into the joint without the aid of a welding nozzle; the pressure is applied directly to the welding rod by the welder. faw. An interruption of the typical structure of a material, such as lack of homogeneity in its structure or physical characteristics. A faw is not necessarily a defect. fow 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 external surfaces while maintaining internal support of material as it becomes molten. The Welding Procedure Specifcation (WPS) specifes 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 fttings 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.