ISO 18278-1:2015
Resistance welding — Weldability — Part 1: General requirements for the evaluation of weldability for resistance spot, seam and projection welding of metallic materials
ISO 18278-1:2015 specifies procedures for assessing the generic weldability for resistance welding of uncoated and coated metals.
It is assumed for this and other linked standards that their application is entrusted to appropriately trained, skilled, and experienced personnel.
For the quality of welded structures, the relevant part of ISO 14554 is applicable. The specification of procedures is to follow guidelines as in ISO 15609‑5.
The purpose of the tests are to
a) compare the metallurgical weldability of different metals,
b) assess the weldability of differing component designs, e.g. dimensional configuration, stack-up, projection geometry, etc.,
c) investigate the effect of changes in welding parameters such as welding current, weld time, electrode force or complex welding schedules including pulse welding, current stepping etc. on weldability, and/or
d) compare the performance of resistance welding equipment.
Precise details of the test procedure to be used will depend on which aspect of items a) to d) will be evaluated relative to the welding result obtained.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Weldability
4.1 Weldability of a component
4.1.1 General
4.1.2 Metallurgical weldability
4.1.3 Operative weldability
4.1.4 Constructional weldability
4.2 Criteria for the evaluation of weldability
5 Preparation of welding equipment
5.1 Welding machine
5.2 Welding electrodes
5.2.1 General
5.2.2 Spot welding
5.2.3 Seam welding
5.2.4 Projection welding
5.3 Measurement of parameters
5.3.1 Welding current
5.3.2 Electrode force
6 Test procedures
6.1 General
6.2 Basic test procedures
6.2.1 Essential variables
6.2.2 Welding current range test
6.2.3 Electrode life test
6.3 Evaluation of weld properties
6.3.1 General
6.3.2 Shop floor tests
6.3.3 Tensile shear testing
6.3.4 Mechanized peel testing
6.3.5 Cross tension testing
6.3.6 Macro-sections and hardness test
6.3.7 Further weld properties
7 Test report
7.1 General
7.2 Welding current range test
7.3 Electrode life test
Annex A (informative) How to evaluate the mass and friction of the welding head
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Weldability
4.1 Weldability of a component
4.1.1 General
4.1.2 Metallurgical weldability
4.1.3 Operative weldability
4.1.4 Constructional weldability
4.2 Criteria for the evaluation of weldability
5 Preparation of welding equipment
5.1 Welding machine
5.2 Welding electrodes
5.2.1 General
5.2.2 Spot welding
5.2.3 Seam welding
5.2.4 Projection welding
5.3 Measurement of parameters
5.3.1 Welding current
5.3.2 Electrode force
6 Test procedures
6.1 General
6.2 Basic test procedures
6.2.1 Essential variables
6.2.2 Welding current range test
6.2.3 Electrode life test
6.3 Evaluation of weld properties
6.3.1 General
6.3.2 Shop floor tests
6.3.3 Tensile shear testing
6.3.4 Mechanized peel testing
6.3.5 Cross tension testing
6.3.6 Macro-sections and hardness test
6.3.7 Further weld properties
7 Test report
7.1 General
7.2 Welding current range test
7.3 Electrode life test
Annex A (informative) How to evaluate the mass and friction of the welding head
Bibliography