Why are intermittent welding avoided for Class E welds on low-temperature steel (such as 09MnNiDR) equipment?
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Why are intermittent welding avoided for Class E welds on low-temperature steel (such as 09MnNiDR) equipment?
Intermittent welding should be avoided for Class E welds on equipment made of low-temperature steel (such as 09MnNiDR), mainly because such steel is more prone to brittle fracture at lower temperatures. Intermittent welding can cause temperature and stress concentration at the weld seam, increasing the risk of brittle fracture in the material under low-temperature conditions. Continuous welding can provide a more uniform weld structure, thereby ensuring the integrity of the weld area and its resistance to brittle fracture. .