We’ve introduced three types of cold crack for ERW steel pipe simply in last essay. For more understanding of it, we will list them for details. Thus, we will know how to decide once we need to purchase them.

Three types of cold cracks are boundary cracks, under-bead cracks and root cracks.

Boundary cracks: This type is from weld and base metal junction began to extend the base material.

Under-bead cracks: In the weld seam below the near area, it is not developed to the base metal surface.

Root cracks: Cracks form originated in the root of the weld notch stress concentration at the heat affected zone, which extends into the base metal or welds.

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