1.1 本规程涵盖了两件可焊接等级的热塑性材料（背衬和非背衬）之间的接头的制备和评估（如 表1 )高达2英寸。厚度为（50 mm）。 1.2 由于塑料焊接不断开发出许多新技术和技术，因此没有任何型材和程序可以被视为各种厚度的所有塑料的标准。本规程不旨在定义概要和程序；然而，其目的是建立方法，以评估焊工为相应塑料实现的最小短期焊接因素。 1.3 用于试件的焊接程序应反映实际制造中使用的程序。 1.4 使用的焊接方法包括机器焊接、挤压焊接和热气焊。 1.5 相关认证机构可利用此做法评估焊工的熟练程度和资格。 1.6 以英寸-磅单位表示的数值应视为标准值。括号中给出的数值是国际单位制的数学转换，仅供参考，不被视为标准。 1.7 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 注1: 没有已知的ISO等效标准。 1.8 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 焊接热塑性结构的机械性能在很大程度上取决于焊接操作的质量。制造商有必要确定是否遵循了正确的焊接程序，并确保焊工保持熟练。 该实践的结果表明，不同热塑性材料的正确焊接程序和使用适当的焊接设备的技能。如果焊接试件的短期焊接系数达到或超过本规程规定的最小值，则可以得出结论，通过焊工的同等技能和勤奋，可以在装配结构中获得可接受的焊缝。

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. 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 shall reflect procedures to be used in actual fabrication. 1.4 Welding methods to be used include machine welding, extrusion welding, and hot gas welding. 1.5 This practice can be utilized by relevant certification bodies to assess welder proficiency and qualification. 1.6 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. 1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Note 1: There is no known ISO equivalent to this standard. 1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 The mechanical performance of welded thermoplastic structures is largely dependent on the quality of the welding operation. It is necessary for fabricators to 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, it can be concluded that, with the same degree of skill and diligence by the welder, acceptable welds can be obtained in fabricated structures.