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The Biggest Risk Visit weldfabworld.com 1. Prevention of Cracking (Most Critical) The primary reason engineers require hardness testing is to avoid Hydrogen Induced Cold Cracking (HICC). Hardness vs. Brittleness: When a weld cools rapidly, it can form a very hard but brittle microstructure called Martensite. The "Trap": If the hardness is too high, hydrogen (from moisture or contaminants) gets trapped in these brittle areas. Under stress, this leads to sudden, delayed cracking. Control: Industry
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FacebookWelding Fabrication World
Hydrogen may be the smallest atom, but in welding it creates serious problems. During welding, hydrogen enters molten metal from moisture, flux, or electrodes. As the weld cools, hydrogen becomes trapped inside the crystal structure and builds internal pressure. This makes the metal brittle and leads to delayed cracking, especially in the heat affected zone. This failure is known as hydrogen induced cracking or hydrogen embrittlement. Using low hydrogen electrodes, proper preheating, and dry ele
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