Dear Prashant,
Generally you will not get this low value for UTS. Its rare case wher the consumable (all weld tenmile) give the less value. To find out the reason of the low UTS you can verify the following:
1) If possible (and material available - Try to make another speciment and test to confirm the situation really exist There may be chances of taking wrong value of load / cross section area calculation.
2) There could be defect (like lack of fusion / Slag in the specimen from where the fracture happened. Total Cross section of the specimen reduced due to the area occupied by the defect hence the breaking(ultimate) load came less but theoritically cross section area calculated is more.
3) Overheating of the weld (above 700 for longer time i.e. more than 1hr) reduce the tensile strength of the consumable. But I am having doubt that for such thickness this type of condition would not exist.
4) Type of fracture and location - There may be no fusion between the "Repair weld" and original weld. If material is too ductile (from the value it looks - there shall be cup and cone shape fracture. And in other extreme case of no fusion between the passes there may flat or step type fracture surface may observed (I hope this would not be the reason)
Regards.
C K Purohit
-- Generally you will not get this low value for UTS. Its rare case wher the consumable (all weld tenmile) give the less value. To find out the reason of the low UTS you can verify the following:
1) If possible (and material available - Try to make another speciment and test to confirm the situation really exist There may be chances of taking wrong value of load / cross section area calculation.
2) There could be defect (like lack of fusion / Slag in the specimen from where the fracture happened. Total Cross section of the specimen reduced due to the area occupied by the defect hence the breaking(ultimate) load came less but theoritically cross section area calculated is more.
3) Overheating of the weld (above 700 for longer time i.e. more than 1hr) reduce the tensile strength of the consumable. But I am having doubt that for such thickness this type of condition would not exist.
4) Type of fracture and location - There may be no fusion between the "Repair weld" and original weld. If material is too ductile (from the value it looks - there shall be cup and cone shape fracture. And in other extreme case of no fusion between the passes there may flat or step type fracture surface may observed (I hope this would not be the reason)
Regards.
C K Purohit
On 26 February 2010 11:09, prashant pansare <prashantpan_99@yahoo.co.in> wrote:
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