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NASA-LLIS-1230
Lessons Learned - Welds Near Tube Bends
Year: 1999
Abstract: Description of Driving Event:
During dimensional inspection of orbital tube welds involving 316L tubing, it was found that 8 of 8 welds failed because of weld mismatch. The weld joints were located between two bends that formed a "S" bend. There was approximately 1 inch of straight tubing from each bend to the joint of the weld. The mismatch in this case is not to exceed 25% or 0.010 inch which ever is less.
Root cause: Tube bending / shaping typically causes the tube to take an oval shape, creating matching problems during weld fitting. Engineering drawings provided insufficient length for oval / runout to occur of the shaped / bent tube prior to welding of the joint.
During dimensional inspection of orbital tube welds involving 316L tubing, it was found that 8 of 8 welds failed because of weld mismatch. The weld joints were located between two bends that formed a "S" bend. There was approximately 1 inch of straight tubing from each bend to the joint of the weld. The mismatch in this case is not to exceed 25% or 0.010 inch which ever is less.
Root cause: Tube bending / shaping typically causes the tube to take an oval shape, creating matching problems during weld fitting. Engineering drawings provided insufficient length for oval / runout to occur of the shaped / bent tube prior to welding of the joint.
Subject: Hardware
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T16:00:35Z | |
| date available | 2017-09-04T16:00:35Z | |
| date copyright | 01/21/1999 | |
| date issued | 1999 | |
| identifier other | RIVEQCAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/63758 | |
| description abstract | Description of Driving Event: During dimensional inspection of orbital tube welds involving 316L tubing, it was found that 8 of 8 welds failed because of weld mismatch. The weld joints were located between two bends that formed a "S" bend. There was approximately 1 inch of straight tubing from each bend to the joint of the weld. The mismatch in this case is not to exceed 25% or 0.010 inch which ever is less. Root cause: Tube bending / shaping typically causes the tube to take an oval shape, creating matching problems during weld fitting. Engineering drawings provided insufficient length for oval / runout to occur of the shaped / bent tube prior to welding of the joint. | |
| language | English | |
| title | NASA-LLIS-1230 | num |
| title | Lessons Learned - Welds Near Tube Bends | en |
| type | standard | |
| page | 2 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1999 | |
| contenttype | fulltext | |
| subject keywords | Hardware | |
| subject keywords | Industrial Operations | |
| subject keywords | NASA Standards | |
| subject keywords | Parts Materials & Processes | |
| subject keywords | Safety & Mission Assurance | |
| subject keywords | Standard |