Max. hydrogen content to limit hydrogen cracking ?
Max. hydrogen content to limit hydrogen cracking ?
(OP)
We have to do some welding on the inside of an existing pressure vessel that has been in service where there has been hydrogen sulfide in the product. Knowing the problems that can arise through hydrogen cracking after welding, are there guidelines for how long the vessel needs to be warmed up at a particular temeprature dependant on hydrogen concentration to drive the diffused hydrogen from the steel so the risk of hydrogen cracking is minimised ?





RE: Max. hydrogen content to limit hydrogen cracking ?
RE: Max. hydrogen content to limit hydrogen cracking ?
RE: Max. hydrogen content to limit hydrogen cracking ?
RE: Max. hydrogen content to limit hydrogen cracking ?
RE: Max. hydrogen content to limit hydrogen cracking ?
Are you going to use Stud Welding process for welding anchors? If yes preheat is also important to have low hardness in HAZ area. If you keep eye on preheat to be maintained within the specified limit, it is the great help.
If you are going to use SMAW process, you have to control the electrode baking too.