On Tue, 2014-07-29 at 22:51 +0200, Lars Andersson wrote: > Yes, > at full current this machine has 20% intermittence factor, at 75A or > less this machine can weld continiously. 75A is fine for what I do. > For TIG I think you do not need long continious weld times. Might be > different if you CNC it though. > > I am not a professional welder and I work mostly in stainless or mild > steel, so I have to take it easy and let the work piece cool down. > Stainless moves around a lot with heat. Weld a centimetre in one place, > move to another part of the joint and weld some there etc. > > The CNC thing I tried was to automate pipe welding by putting the pipes > on a rotating axis and then rigidly place the torch over the joint to be. > The result was not very exciting so I put this project aside. (Like most > of my projects) > > > > > Hi > > someone say that all welders - can work - continuously only 1-2-3 minute > > and than need about 10 minute to cool down. > > is this right? > > also when deposit part with welding - should it have cool down time ? > > because it will get super hot and it may result in warping -deformation? > > did you find those problem? > > > > > > > > > > On Tue, Jul 29, 2014 at 12:16 PM, Lars Andersson <[email protected]> > > wrote: > > > >> In this case I did blindly control the weld current via the PWM output. > >> The TIG machine is a current regulating controller, it keeps the current > >> to what is commanded. > >> The unit I controlled was an Kemppi Mastertig 1500 > >> > >> I did initially measure the current with a clamp on toroidal DC probe on > >> the return lead. You might think that the arc-start spark voltage is a > >> problem, but it worked quite well for me. > >>> Hi > >>> Lars > >>> ---I am doing something similar with a TIG welder where 0 - 5V > >> corresponds > >>> ---to 0 - 160A welding current. > >>> > >>> > >>> what kind sensor-device do you use to read 160A current ? > >>> > >>> thanks > >>> aram > >>> Me thinks there are water cooled TIG torches for a reason. On the missile sites ( Atlas and Titan I) they used Hobart 300 amp welders. Unfortunately we never got to see them weld as we arrived at the end of their shift to do X-ray. The pipe was schedule 40 thru XX in diameters between an inch and 1.75 inches. But that was > 50 years ago so who knows if I remember correctly.
For heavy use there are two issues here. The duty factor of the welder and the duty factor of the torch. As an aside I keep wondering how you are going to feed filler rod? Dave > >> > >> > >> ------------------------------------------------------------------------------ > >> Infragistics Professional > >> Build stunning WinForms apps today! > >> Reboot your WinForms applications with our WinForms controls. > >> Build a bridge from your legacy apps to the future. > >> > >> http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk > >> _______________________________________________ > >> Emc-users mailing list > >> [email protected] > >> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > > ------------------------------------------------------------------------------ > > Infragistics Professional > > Build stunning WinForms apps today! > > Reboot your WinForms applications with our WinForms controls. > > Build a bridge from your legacy apps to the future. > > http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > ------------------------------------------------------------------------------ > Infragistics Professional > Build stunning WinForms apps today! > Reboot your WinForms applications with our WinForms controls. > Build a bridge from your legacy apps to the future. > http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Infragistics Professional Build stunning WinForms apps today! Reboot your WinForms applications with our WinForms controls. Build a bridge from your legacy apps to the future. http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
