Scope@ Purpose@ and Range of ApplicationThese guidelines list and describe defects in welded joints in thermoplastic materials. The objective is to make possible a generally valid evaluation giving consideration to graded quality requirements.By classification into one of the evaluation groups in 4.1@ specific defects can be excluded or kept within limits when welded joints are produced.The application of these guidelines and the measures through which they can be met may be included in contractual specification or form part of the generally recognized specifications.Welding Processes.Defects produced by the following welding processes are addressed. This guide applies to the following processes:Materials.These guidelines apply to welded joints on components and systems made from the engineering thermoplastics listed below:The use of these guidelines for welding other thermoplastic materials must be agreed upon between the customer and the fabricator.This standard makes use of the International System of Units (SI).Safety.The activities described in this document may bring the user of this standard in contact with processes and materials that may be hazardous to the user??s health. Safety precautions mandated by OSHA and recommendations for material handling in MSDS sheets should be observed. The fabricator??s operating manual and safety instructions should always be carefully studied and complied with when operating equipment.Note: This standard may involve hazardous materials@ operations@ and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user to establish appropriate safety and health practices. The user should determine the applicability of any regulatory limitations prior to use.