Hårdlödning - Oförstörande provning av hårdlödda lödförband
This European Standard describes non-destructive examination procedures and testpiece types necessary to perform the tests on brazed joints.
The non-destructive examination methods described are as follows:
a) visual examination (see clause 4);
b) ultrasonic examination (see clause 5);
c) radiographic examination (see clause 6);
d) penetrant examination (see clause 7);
e) leak testing (see clause 8);
f) proof testing (see clause 9);
g) thermography (see clause 10).
The brazed joints to which these tests are applied can either be test samplesmanufactured to obtain brazed joint design data, or manufactured as part of theapproval testing of a brazing procedure, or parts of a brazed assembly. The type oftest piece described for each test can be quoted or incorporated in engineeringapplication standards that deal with brazed assemblies.
This European Standard does not recommend the number of samples to be tested orthe repeat tests allowed. Neither does it specify methods of sampling brazed joints,except to give guidance regarding the precautions necessary, nor does it comment onthe acceptance criteria applicable to any of the tests. No attempt is made to definewhich test or tests, if any , should be applied in any situation. This is a matter to beestablished before any particular method of test is selected.
The methods of non-destructive examination are not associated with any particulartype of brazed assembly but lay down the general principles of the types of testingdescribed. It is emphasised that a satisfactory examination method can only bedeveloped and used after taking into account all the relevant factors regarding theequipment to be used and the characteristics of the test piece being examined.