Original Posted By: "Douwe Blumberg"
Thanks William for taking the time to give such a thorough and practicalexplanation/warning.This is the type of stuff that sneaks up on us and can bite us bad and Ithink it's great to get a dose of reality sometimes.See you soon!Douwe________________________________________________________________________________
Pietenpol-List: WW's post
Pietenpol-List: Re: mild steel-4130
Original Posted By: "AG"
We MIG a lot of aluminum, and I tig'd my Piet together, but haven't migged4130. I've not heard of it being tricky, and almost every race car you seeis migged 4130 tubing, so it can't be that hard.I don't honestly think the control system experiences any strong loads, justrepetitive type movements and it worked fine before 4130. Just be sure thatthe "mild steel" you choose is at least the equivalent of what Bernard used.However. I would still use 4130 because I'm sure it migs fine, might be afew tricks, but shouldn't be too hard.$.02Douwe________________________________________________________________________________Subject: Pietenpol-List: Re: mild steel-4130
We MIG a lot of aluminum, and I tig'd my Piet together, but haven't migged4130. I've not heard of it being tricky, and almost every race car you seeis migged 4130 tubing, so it can't be that hard.I don't honestly think the control system experiences any strong loads, justrepetitive type movements and it worked fine before 4130. Just be sure thatthe "mild steel" you choose is at least the equivalent of what Bernard used.However. I would still use 4130 because I'm sure it migs fine, might be afew tricks, but shouldn't be too hard.$.02Douwe________________________________________________________________________________Subject: Pietenpol-List: Re: mild steel-4130
Pietenpol-List: Re: mild steel-4130
Original Posted By: "tkreiner"
Thanks for your thoughts - I would prefer to use to use 4130 - even if it is overkill - because safer is better- If I can mig 4130 safely that's the way I'll go. I guess my only reservation is the ability to test my welds. Do you know of any way to test my mig welds on 4130 other than the "bash" test(bash it with a sledge until it breaks)? In my reading the concerns with mig on 4130 are that the high localized heat cancreate "break points" just beyond the HAZ (heat affected zone) of the weld.If oxy/acetylene is much safer with 4130 - I could just start learning (I can getaccess to a torch). - but like I said I've done quite a bit with mig so myconfidence/proficiency is much higher with mig.Thanks,AndyRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: mild steel-4130
Thanks for your thoughts - I would prefer to use to use 4130 - even if it is overkill - because safer is better- If I can mig 4130 safely that's the way I'll go. I guess my only reservation is the ability to test my welds. Do you know of any way to test my mig welds on 4130 other than the "bash" test(bash it with a sledge until it breaks)? In my reading the concerns with mig on 4130 are that the high localized heat cancreate "break points" just beyond the HAZ (heat affected zone) of the weld.If oxy/acetylene is much safer with 4130 - I could just start learning (I can getaccess to a torch). - but like I said I've done quite a bit with mig so myconfidence/proficiency is much higher with mig.Thanks,AndyRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: mild steel-4130
Re: Pietenpol-List: Re: mild steel-4130
Original Posted By: earthlink1
Andy,Perhaps one of the greatest things about building a Piet is that you will developlots of new skills...So, consider that gas welding class, and give it a try. Gas welding is easy, andonce you weld a few test pieces together, you'll ask yourself why you everquestioned trying it.Keep in mind aircraft welds are never ground down or smoothed, so the skill youdevelop will display your craft to all...Just my $0.02--------Tom KreinerRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Re: Pietenpol-List: Re: mild steel-4130
Andy,Perhaps one of the greatest things about building a Piet is that you will developlots of new skills...So, consider that gas welding class, and give it a try. Gas welding is easy, andonce you weld a few test pieces together, you'll ask yourself why you everquestioned trying it.Keep in mind aircraft welds are never ground down or smoothed, so the skill youdevelop will display your craft to all...Just my $0.02--------Tom KreinerRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Re: Pietenpol-List: Re: mild steel-4130
Re: Pietenpol-List: Re: mild steel-4130
Original Posted By: Jack Textor
Andy,I'm no expert on welding, but I think there was a discussion of this in the archives(or maybe I read it somewhere else- Bingellis?), and the bottom line wasyou can MIG 4130 and then heat the entire area cherry red with a gas torch andallow it to air cool and your weld should be good to go. You should verifythis, but that's what my middle-aged brain remembers.Kip GardnerOn Jul 7, 2014, at 9:13 AM, AG wrote:> > Thanks for your thoughts - > > I would prefer to use to use 4130 - even if it is overkill - because safer isbetter - If I can mig 4130 safely that's the way I'll go. > I guess my only reservation is the ability to test my welds. > > Do you know of any way to test my mig welds on 4130 other than the "bash" test(bash it with a sledge until it breaks)? > > In my reading the concerns with mig on 4130 are that the high localized heatcan create "break points" just beyond the HAZ (heat affected zone) of the weld.> > If oxy/acetylene is much safer with 4130 - I could just start learning (I canget access to a torch). - but like I said I've done quite a bit with mig so myconfidence/proficiency is much higher with mig.> > Thanks,> > Andy> > > > > Read this topic online here:> > http://forums.matronics.com/viewtopic.p ... 238#426238> > > > > > > > > > ________________________________________________________________________________Subject: Re: Pietenpol-List: Re: mild steel-4130
Andy,I'm no expert on welding, but I think there was a discussion of this in the archives(or maybe I read it somewhere else- Bingellis?), and the bottom line wasyou can MIG 4130 and then heat the entire area cherry red with a gas torch andallow it to air cool and your weld should be good to go. You should verifythis, but that's what my middle-aged brain remembers.Kip GardnerOn Jul 7, 2014, at 9:13 AM, AG wrote:> > Thanks for your thoughts - > > I would prefer to use to use 4130 - even if it is overkill - because safer isbetter - If I can mig 4130 safely that's the way I'll go. > I guess my only reservation is the ability to test my welds. > > Do you know of any way to test my mig welds on 4130 other than the "bash" test(bash it with a sledge until it breaks)? > > In my reading the concerns with mig on 4130 are that the high localized heatcan create "break points" just beyond the HAZ (heat affected zone) of the weld.> > If oxy/acetylene is much safer with 4130 - I could just start learning (I canget access to a torch). - but like I said I've done quite a bit with mig so myconfidence/proficiency is much higher with mig.> > Thanks,> > Andy> > > > > Read this topic online here:> > http://forums.matronics.com/viewtopic.p ... 238#426238> > > > > > > > > > ________________________________________________________________________________Subject: Re: Pietenpol-List: Re: mild steel-4130