ISO 17635:2016根据质量要求、材料、焊缝厚度、焊接工艺和测试范围，为焊缝无损检测（NDT）方法的选择和质量控制结果的评估提供了指南。 ISO 17635:2016还规定了适用于不同类型试验的一般规则和标准，包括金属材料的方法或验收水平。 验收水平不能直接解释ISO 5817或ISO 10042中定义的质量水平。它们与生产批次焊缝的整体质量有关。 NDT验收等级要求仅在一般基础上符合ISO 5817或ISO 10042（中等、中等、严格）中规定的质量等级，而不是每个指示的详细要求。 附录A给出了质量、无损检测和验收水平标准之间的相关性。 附录B概述了与质量等级、验收等级和无损检测方法相关的标准。

ISO 17635:2016 gives guidelines for the choice of non-destructive testing (NDT) methods for welds and evaluation of the results for quality control purposes, based on quality requirements, material, weld thickness, welding process and extent of testing. ISO 17635:2016 also specifies general rules and standards to be applied to the different types of testing, for either the methodology or the acceptance levels for metallic materials. Acceptance levels cannot be a direct interpretation of the quality levels defined in ISO 5817 or ISO 10042. They are linked to the overall quality of the produced batch of welds. Requirements for acceptance levels for NDT comply with quality levels stated in ISO 5817 or ISO 10042 (moderate, intermediate, stringent) only on a general basis and not in detail for each indication. Annex A gives correlations between quality, NDT and acceptance level standards. Annex B gives an overview of the standards linked to quality levels, acceptance levels and NDT methods.