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Bubble leak testing
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Positive pressure test where leakage is indicated by formation of bubbles in the solution film by escaping gas. methods include immersion, vacuum box, and bubble solution tests. c
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Burn through, английский
In welding, coalescence of metal protruding beyond the root of the weld. sometimes called icicles. burnt-in sand: in manufacturing, discontinuity consisting of mixture of sand and metal cohering to surface of casting.
Brinell hardness testing, английский
- Evaluation method for determining the hardness of a material by forcing a hard steel or carbide ball of specified diameter (often 10 mm) into it under a specified load. the diameter of the indent is measured, and the result is reported as the material’s brinell hardness number. compare rockwell hardness testing.
- Evaluation technique for determining the hardness of a material by forcing a tungsten carbide ball of specified diameter (often 10 mm) into it under a specified load. the diameter of the indent is measured and the result is reported as the material’s brinell hardness number with tungsten carbide (hbw; as “w” is the chemical symbol for tungsten). previously a hardened steel ball indenter was used. compare rockwell hardness testing.
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