Today's KNOWLEDGE Share:
𝐖𝐡𝐲 𝐝𝐨 𝐰𝐞𝐥𝐝𝐬 𝐜𝐫𝐚𝐜𝐤?
- 𝗔 𝘄𝗲𝗹𝗱𝗶𝗻𝗴 𝗰𝗿𝗮𝗰𝗸 is fracture-type linear imperfection having a sharp tip with a higher length and very small width.
- Welding cracks can appear in weld deposits, heat-affected zones (HAZ), and base material.
- They occur once the localized stresses exceed the ultimate tensile strength of the base metal.
- 𝗜𝗻𝗶𝘁𝗶𝗮𝗹 𝗖𝗿𝗮𝗰𝗸𝗶𝗻𝗴 usually starts at stress concentrations due to other defects or sharp notches (notches work as stress concentration) in the nearby area.
- These stresses can be residual stresses caused by the welding or stresses applied due to service or other external loading.
- 𝗥𝗲𝘀𝗶𝗱𝘂𝗮𝗹 𝘀𝘁𝗿𝗲𝘀𝘀𝗲𝘀 in welding are caused by weld solidification and thermal expansion properties of the metal.
- In welding cracks, there is little plastic deformation as most of the cracks either occur due to high hardness or Stress.
Sources:weldguru.com/www.materialwelding.com
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