To be Cracked on base metal after welded
To be Cracked on base metal after welded
(OP)
Can anyone help me about a problem as following:
We are building up vessel OD 3800 and use material Q345B made by china.When we was welded for long seam,the cracks appeared vertical weld seam. We have been proceed test for tensile and yield strength and chemical composition on base metal but the results were accepted. The weld procedure specification (WPS) and consumable to be used correctly. We have also preheat before welding but after RT the cracks appeared for full weld. We are intending replace all new material but cost impact take many.
I hope everybody give me the best solution. Thanks so much
We are building up vessel OD 3800 and use material Q345B made by china.When we was welded for long seam,the cracks appeared vertical weld seam. We have been proceed test for tensile and yield strength and chemical composition on base metal but the results were accepted. The weld procedure specification (WPS) and consumable to be used correctly. We have also preheat before welding but after RT the cracks appeared for full weld. We are intending replace all new material but cost impact take many.
I hope everybody give me the best solution. Thanks so much





RE: To be Cracked on base metal after welded
RE: To be Cracked on base metal after welded
RE: To be Cracked on base metal after welded
More information, please: thickness, preheat temp., impact test ??.........
Regards
r6155
RE: To be Cracked on base metal after welded
Get a copy of ANSI/AWS B1.11 Guide for the Visual Inspection of Welds by the American Welding Society. This guide has a lot of colored photographs showing cracks and explains the causes.
Your cracks appear to be longitudinal types made with a welding machine and the most likely cause per the guide is high welding speed or sometimes such crack is related to porosity that does not show at the face.
RE: To be Cracked on base metal after welded