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I have a tig welded assembly- the joined parts are .062"-.08" thick. There is one joint I'm planning to fusion weld 17-4 to 316L unless that is an issue. There is another fusion 316L to 316L- both these welds have no filler material. a stamped .07-.08" thick component is going to be welded to the 316L. I have a choice of 625 or 718 sheet for the component and errosion resistance is desired. The question is should I use vacuum age hardened 718 35RC, 316L and inconel 82 filler rod, or 625 inconel 316L and 625filler rod.The part is subjected to 1200-1500F and gas pressure to 1900PSI and I gather around 1600F aged inconel 718 and 625 have equal 40KSI yeild strength- the 718 can heat crack because of hardening and has greater strength below1600F but has the risk of cracking in the heat affected zone of the welded 718. 625 isn't as strong or durable, but appears to be more user friendly. I know 625 will weld to 625 and to 316L but I have no property data on the tensile and yield of the 625 filler when welded to a 316L and want to use 625 only if it provides greater yield than 308 filler rod. The information I do have is that inconel 82 filler has greater impact strength and strength while the 625 filler is more corrosion resistant.What do you guys recommend. ?Last edited by manoftin2; 12-26-2010 at 06:15 PM.
Reply:625 if it were mine. I weld alot of dis-similiar metal boiler tube welds and 625 is what we always use.
Reply:I recommend you consult an actual engineer in person, I cannot imagine why people bring questions like this to an internet forum. You have no idea if the information is credible or not and it sounds like this is a project that would have a fair bit of money invested into it.Plus, when I dole out information like this I expect to be a paid for it. It is my career afterall.Have we all gone mad?
Reply:Man, I thought they were canceling the space shuttle program....Sorry Snoboarder88, I had to!! But I have to agree, the right thing to do is to find/ consult with a QC/ weld tech who has experience with similar materials. I suppose pics are out of the question at the moment??? It sounds interesting as all let out.And then, after so much work...... you have it in your hand, and you look over to your side...... and the runner has run off. Leaving you holding the prize, wondering when the runner will return.
Reply:Originally Posted by sn0border88I recommend you consult an actual engineer in person, I cannot imagine why people bring questions like this to an internet forum. You have no idea if the information is credible or not and it sounds like this is a project that would have a fair bit of money invested into it.Plus, when I dole out information like this I expect to be a paid for it. It is my career afterall.
Reply:Whats the difference? I dont want to be flying around on a plane or working around a boiler system when a part fails because someone got advice on how to make it from a crackpot on the internet. Thats the difference.Are there people on here that have the appropriate background to give an informed and correct solution to the problem? Absolutely, but how does one distinguish that person from the one who welds with a silent beam? There are limits to what kind of information people should gather from the internet, and when they should consult a professional in person.Last edited by sn0border88; 12-27-2010 at 08:25 PM.Have we all gone mad?
Reply:The question was probably too detailed. The poster is correct, if people don't want to discuss welding, that defeats the purpose of a welding forum. The question was intended for people who have experience welding 718 or 625. It doesn't sound like you have, so your posts are off topic.
Reply:You misunderstand, I would love to hear a thought out and detailed discussion on this topic but that is not the issue at hand.From what you explained to us, this is a fairly important part that will see very high pressure and service temperatures; probably part of a turbine or boiler?Maybe im just over concerned, but I would not want to base a critical design decision on the opinions of persons who I could not verify their experience and credentials. Ive been around here to see some real nutjobs try to feed people horrible advice, with disturbing success.I would love to hear any additional information people have about this, but the point I am trying to stress is that you need to consult an actual welding engineer.(I am currently seeking my BA in Welding Engineering, so maybe I am slightly biased.) Have we all gone mad?
Reply:Agreed, those kind of pressures for gas lines are nothing to be taken lightly. Strange that a job like this doesn't have everything already laid out by QC guys, planners and engineers.I am a licensensed operating engineer with the TSSA myself.Last edited by snoeproe; 01-01-2011 at 09:51 PM.JasonLincoln Idealarc 250 stick/tigThermal Dynamics Cutmaster 52Miller Bobcat 250Torchmate CNC tableThermal Arc Hefty 2Ironworkers Local 720 |
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发表于 2021-8-31 23:31:32