ISO 17279-3:2021 Welding — Micro joining of second generation high temperature superconductors —Part 3: Test methods for joints

标准简介

Welding — Micro joining of second generation high temperature superconductors —Part 3: Test methods for joints是于2021-02发布的ISO标准，适用于全球范围。

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标准部分原文

Welding — Micro joining of second generation high temperature superconductors —

Part 3: Test methods for joints

1 Scope

This document specifies the requirements for the test methods for joint of micro-joining of 2G HTS to fulfil the requirements of ISO 17279-1 and ISO 17279-2.

This document specifies test methods for determining the capability of joints for the production of the specified quality. It defines specific test requirements, but does not assign those requirements to any specific product group.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 17279-1:2018, Welding — Micro joining of 2nd generation high temperature superconductors — Part 1: General requirements for the procedure

ISO 15607:2019, Specification and qualification of welding procedures for metallic materials — General rules

3 Terms a nd definiti ons

For the purposes of this document, the terms and definitions given in ISO 17279-1 and ISO 15607 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://w ww. iso. org/o bp

— IEC Electropedia: available at http:// www.e lectropedia .org/ 4 Test methods for joint

4.1 General

ISO 17279-1:2018, 5.5.4, describes requirements for qualification of test personnel, for test methods, witness during testing and retesting. Especially, ISO 17279-1:2018, Table 1, shows the type of testing, the extent of testing, the confirmation of testing, and required tests for the procedure qualification according to ISO 17279-1. ISO 17279-1:2018, 5.9, requires the acceptance criteria of the tests. The manufacturer can have at their disposal sufficient competent personnel for the testing and operating the test equipment, or can contract the specific tests to the specialized organizations. The manufacturer can witness the tests from specimen preparation to data acquisition and analysis according to manufacturer’s quality assurance requirements.

The operating procedures and cautions of the test equipment shall be applied when the equipment is used for testing according to this document. The operator of the specific equipment shall establish the capability to perform the required test, and calibration and qualification of the test equipment shall

be maintained up-to-date according to an appropriate quality management program. Qualification records and certificates shall be kept up-to-date.

The tests except visual testing shall be performed at the cryogenic environment and do not purport to address the safety concerns associated with its use. It is the responsibility of whoever uses this method to establish appropriate safety and health practices prior to use.

4.2 Visual testing

4.2.1 General

This subclause defines the method of visual testing of materials and joints used in 2G HTS.

4.2.2 Qualification of test personnel

Testing shall be conducted by qualified personnel. Personnel qualification shall be done according to an appropriate quality management program. Personnel conducting visual testing shall annually pass an examination where their vision, with or without correction, meets the Jaeger J2 near vision test at a distance not less than 30,5 cm as well as a colour perception test. The vision examination records shall be maintained for the current year and shall be available for review.

4.2.3 Test equipment

Calibrated instruments shall be used for testing, wherever required, this includes all necessary measuring instruments and gauges.

4.2.4 Surface condition and preparation

The surface for the test shall be uniform and smooth and shall be clean and free of scale, rust, oil, grease, detrimental oxides and other deleterious foreign materials such as Ag or Cu spots of 2G HTS. The surfaces of the finished joints shall be suitable to permit proper testing. All joint preparations shall meet drawing specified dimensions (whether provided via dimensions on the drawing or in a welding specification). If no dimensions are provided as part of the drawing or ordering documents, the dimensions shall meet dimensions specified by approved welding procedure specification (WPS).

4.2.5 Testing

Testing shall be performed in accordance with a written procedure or method applicable under testing. The testing area shall include the joint and the accessible adjacent heat-affected zone (HAZ) for some distance from the joint edge of the base metal. The testing shall be in the after joining and final heat-

treated condition (oxygenation annealing), or otherwise required, and be free of all coatings and other surface conditions such as paint, plating, etc. The joints shall be tested in the as-welded condition. Testing will be conducted with specimen suitable dimensions.

Direct visual testing shall be used. If required, mirrors and magnifying lenses are used to improve the angle of vision and to assist. The minimum light intensity at the surface is 1 000 lux (100 foot-candles). The written procedure or method shall include, at a minimum and either directly or by reference to applicable document(s), procedure identification number and date, revision number, identification of joints, complete testing requirements including lighting and method of testing, evaluation of indications, acceptance criteria, disposition of joints after evaluations.

4.2.6 Acceptance criteria

The requirements of ISO 17279-1:2018, Table 4, shall be met. Lack of bonding, lack of fusion, cracks and pin holes are not acceptable.

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