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发表于 2008-6-16 20:57:50
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版权归‘焊接飞溅’所有，侵权必究
编号code：KNPS-HPS-NES-0300-HJ-G02a-A00
| | | | | Explain about chimney welding manual | | 喀土穆北电站三期扩建项目工程KNPS Extension Project Phase III | | | | □通知notice □建议suggestion□联系connection□备忘memory□其他other
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The welding manual of chimney welding has words like that “Generally, butt-weld root gap of basal plate longitudinal and girth seams is 1-3mm”, this means groove butt welding root gap 1-3mm is
commendatory, and not indispensable. Root gap 1-3mm is ideal state, we are not bookworm, obey the rule without the thinking of the practical condition. The inner diameter of chimney is 3500mm,if one point or small part of girth groove butt gap is not met the requirement, cutting most of girth plate to fit the unnecessary root gap1-3mm is unadvisable, and is waste of our limited resource. Root gap is none essential variable to welding procedure specification, it can be modified (seeing KNPS-HPS-NES-0300-HJ-G02a-A180). In your letter KNPS-MMS-CMES-0117mfk, NEC/MML already accepted 5mm root gap on some condition, and accepted 4mm root gap without doubt.
500-800mm spacing of tack welding may be unseemly, we got the data according to our experience. In this project we need to change the spacing to 200-400mm in order to prevent welding deformation.
Your understand is highly appreciated.
Thanks for your cooperation.
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发表于 2008-6-11 22:12:07
