NON-DESTRUCTIVE CONTACTLESS METHOD FOR CONTROLLING TIGHTNESS BY GAS-DISCHARGE VISUALISATION

摘要

The invention relates to tightness test methods and can be used for controlling welding seams of articles containing working medium (substance), for example of chemical current sources. The inventive method consists in exposing a controlled article to a high-voltage impulse electric field which is formed between a positive electrode and the metallised layer of the article body, recording on a photocarrier by placing said article on a dielectric plate arranged on a positive electrode, whose surface area is selected such that the ratio therebetween and the article surface area is equal or greater than 7:1. Afterwards, the article is exposed to the additional action of the electric field of the prepolarized dielectric plate whose surface area is selected such that the ratio thereof with respect to the positive electrode surface area is equal to 1.2:1 and which is disposed on the positive electrode symmetrically with respect to the centre thereof between said electrode and the controlled product.