Joining Dissimilar Materials With TIG Welding P2

but my dog stools I'm Tom so today what we're doing is we're continuing on with this TIG welding of dissimilar metals I want to introduce a different filler material that I've used to join stainless to copper and copper to copper this material produces a reasonable weld very low resistance for electrical purposes we've actually measured it very carefully so if you need to make a a connection electrically this is a really good technique for that we've also used it to weld stainless steel the copper and make vacuum tight joints with it as well I don't know much about the structural qualities of it so I wouldn't build any bridges with it or anything like that but it it holds uhb vacuum it does not off gas we've checked it with a residual gas analyzer and it's very clean and it's a low electrical resistance now what we're showing here is a technique for joining stainless steel to brass or stainless steel to copper or copper to copper which can be a tricky joint this material melts at a lower temperature and and behaves much like soldering or or braising but with TIG welding so without the messy fluxes and and whatnot so I guess some I got some bits cut over here at the welding table and we'll do some test joints and then a couple of newer suggested that I break apart the joint that we did with the silicon bronze which is the first part of this series and and we're gonna take a look at that to bust that open and you get a look at the weld there so and practicing my my my arc shots my arc welding on video so we'll see if I'm improving there so I'm trying anyway let's get an apron on let's go over to the welding area and let's put some stuff together ok so here's here's the sample that we did in the first video welding dissimilar metals with TIG welding and so we have 360 brass two stainless steel and we got some welds on there and a couple of viewers suggested that I that I try to break these which we're gonna do I think that's a good idea we'll see what to see what this looks like but I also wanted to show a different kind of rod also we'll get to that in just a second so I got some some more blanks set up here these are stainless steel that's 360 brass the square and then this rectangular stuff this is copper here so we're going to do a couple different joints here with this other material that I'll talk about in just a minute and but meanwhile let's let's take this over to the vise and see if we can break that and get a look at and see what that well looks like okay so we got this in the vise here this one's welded on both sides here some and I'm gonna pop this one loose since it's welded on one side and will probably be a lot easier to pop loose let's then in there it's in in there pretty good and I'm just gonna use a pry bar here and we're just gonna try to lever that off which it's coming right off okay so it's loose enough that they can alright alright that's failing on that side if we can get that up there well that's it's failed kind of right through the the silicon bronze material which is actually kind of good so it's connection to the to the base material seems to be pretty good so we've you know these materials dilute well the the lower temperature materials dilute themselves a little bit so that's actually not bad it's I kind of expected it to pull out of the brass myself but that that was pretty good let's let's let's try doing something to that one and see if we can get that but now this was welded on both sides so that's probably going to take a little more a little more elbow grease there let's try this you know pretty good purchase on that get my snap-on pry bar in there I think I'm just pulling it out of the vise now bent that so that's that's quite a bit of force to actually bend a 3/8 brass thing that close okay let me try that again see if I can get it to break I get that let's put some garlic on that try that again okay so I gave it a did it a little more suddenly that's it yet and once again it broke on the filler interface there which is kind of good and it's pretty good shot all right so that was actually a fair amount of force to get that to break I wasn't being shy on that but and it broke right right through the filler material anyway I'd say that's a pretty good joint you know considering this is a brass is a pretty wimpy material stainless is certainly stronger but you know you're not a so you're not a you know lifting you're not building a crane with this technique okay this is more of a decorative type welding application so okay so got some strength how much kind of hard to stay okay so here's here's our samples again stainless steel 360 brass and copper and this is the ride that we're going to use here and what this is this is basically a silver brazing alloy and it's got a really bad rubber band on it yeah alright so we're not going to use it and so there's a reason to not use a rubber band to hold the rods together it's actually kind of left the residue on there it's probably not conducive to welding so alright anyway so this particular rod here there's two alloys here this particular one is 15% silver and then the rest is copper and then a little bit of phosphorus this one has a lower silver content so it's five percent silver eighty-nine percent copper and five percent phosphorus so these are silver brazing alloys that you would normally use with a torch and on flux and and that kind of thing but they actually work really well for joining dissimilar metals at low temperatures with TIG welding so I want to show these and we're going to duplicate that joint that we just broke a little while ago would kind of do the same thing we'll probably do one copper and one brass I don't know if I'll use both rods I'll probably use the the cheaper this is cheaper because it's got less silver in it we'll use this one and and I'll put the part numbers at the end of the video so you guys can see it and I'll try to get some arc shots here so you can kind of see how this stuff behaves and then we'll try it busting these joints and you guys can get a sense of how this stuff behaves I got a little bit of silicon bronze left which is actually another good rod to join copper to copper maybe I'll find another piece of copper and we'll do a straight copper to copper joint with silicon bronze - so okay alright so let me get set up for welding here and then we'll do some welds all right so we're going to try this five percent silver brazing alloy three-sixty brass the stainless feel okay so you can see that came out pretty good so this is the five percent silver eighty nine percent copper five percent phosphorus so we didn't get we got a little bit of zinc fuming here so you can see that this is already a lower temperature type joint and that stuff lays in there pretty good so what we're gonna do now is I'm gonna leave that one alone and I'm just going to turn this around and on this same piece we're gonna go ahead and attach a piece of boots attach a piece of copper here as well to kind of you know continue on with the test here so we're gonna weld copper to stainless here with this same rod and then I think the final will be the copper to copper with the same material the same filler material okay so here's a stainless steel to 360 brass and then stainless steel to copper and this is with this five person five percent silver 89 percent copper five percent phosphorus rod now this piece got pretty hot just because it's copper and it conducts heat real well but it's basically a low temperature process this need not get to melting temperature to do this process you know I'm gonna let this cool off a little bit I'm not going to weld the backside here because what we want to do is we want to try to break these off and and see what see what happens when we break those off and then the last joint that I'm gonna do is copper to copper with the same material here and we'll see how it behaves okay okay so here's the basic machine settings DC polarity we're straight I'm in high range and I have my main current control set kind of at a maximum of say 200 amps although I'm controlling it with the foot pedal remote current control which is foot pedal just a high frequency start no pulsing no no funny business there just kind of straight TIG welding this would be the same types of settings you would use for stainless steel or steel okay okay so this is the excuse me 360 brass to copper with this silver brazing alloys now I haven't done anything other than just cool it off now brush it a little bit now one issue with this particular rod is it doesn't it doesn't have a good color match between copper to copper or brass - brass or copper to brass it ends up with kind of a dark the weld is darker colored so you don't get a good color match if you're doing something where it that matters okay and sometimes it does matter okay so we did this 360 brass - copper and then the last one we're gonna do is we're just going to do copper to copper here like that and I'll leave it open a little bit like that it just makes the weld go a little easier instead of trying to generate enough heat to get it to flow there so we'll leave a little gap like that and we'll just run a little weld along that and see how it goes you know let's go okay so this thing's still hot here this is the copper to copper that we just did and I'm gonna go cool that off and then we'll brush it I'll probably hit it I'm gonna hit it on the power brush that way you guys can kind of see this color match thing that I had mentioned earlier so let me cool that off and I'll brush it okay so there it is polished up it's a little bit hard to tell and this but if you grind that down and try to blend that all in you get it you end up with a dark line where this material is or a darker line so that's what I mean by color match maybe this doesn't illustrate that that well but anyway there it is so now let's go over and let's try breaking some of this stuff and see what we get okay so here's our our samples here this first things first and you know we broke this other one this was the silicon bronze here so this one here is this five percent silver 89 percent copper five percent phosphorus we did the brass two stainless so let's let's pop that one first and see what we get there so I'm gonna underneath there see we can we can lever that loose oh yeah that one comes loose pretty pretty easily and we get a separation at right at the stainless steel interface there so remember this is brazing material here this is a welding material we're not welding here this is a it looks like a well but it's not a weld okay and there's the inside of that so it looks like it pulled up a little bit of the stainless hard to say it made this be arc scarring there I don't know anyway it had some strength but not a lot you know we're torturing that joint pretty pretty pretty hard a weld on the other side would it increase the strength dramatically let's try the copper now actually you know what I'm just gonna leave it right there if we get underneath it and get this one going same thing so that one the copper side of the joint is pretty good but the stainless steel side of the joint is not so good but once again a very you know a serviceable joint for non structural kinds of applications let's see put that right back in there yeah there it's a clean it's a clean fracture yeah wait okay all right let me reset the camera and then we'll try this one here okay so let's pop this loose so let's do the brass one first so what I'm going to do is I'm just going to clamp it like this and then I'm gonna knock it over with a hammer it only took me about a half an hour to pick out which hammer I wanted to use I have so many choices all right so that puts pretty good so let's wink okay now this one let's get this back up here so this one kind of uh well it came apart in a different way so we came off of the brass and then we got into the copper so this is probably closer to the ultimate strength of this material see if we can put that back together there dad but it's a brittle fracture through that through that weld so this material is not real real ductile I could say that and as I started to hit it I hit it a little high and we opened up this copper one too so let's let's do that one next well--we're while we're here yeah thank ok so the weld lacks ductility but it does make a joint if the joint had its own mechanical support you know a tube inside of a bore or something like that where it had its own mechanical support and all this weld was doing was sealing it or joining something and it would perform pretty well don't go weld any lifting equipment with this material here this is probably not a good choice okay okay so these are our test victims here this was our original silicon bronze stainless steel to grass that we we broke apart this said this had pretty good strength to it we were able to actually yield this brass and before the weld started to fail so that was pretty good and then the next one was this guy here and this was our silver bearing a filler rod the weld did not exhibit any ductility and fractured kind of in a catastrophic way although it's still a valid process for for joining dissimilar metals this depends on the the type of joint and the the performance needed in the joint there so so that's that one and then this last one was our red medals joined together so we have copper to copper here copper copper with our silver and then copper to brass with our silver and once again they exhibited the same qualities as this roughly the same no no well ductility per se so it's kind of a hard hard weld anyway I think that concludes this thing unless somebody has a suggestion for for a continued Avenue of Investigation here I think we're gonna stop here with this anyway hope you liked it I'll put the links up to this to this material here that uh that we use this five silver and thanks for watching guys you

Channel: oxtoolco

Views: 13,354

Rating: 4.968421 out of 5

Keywords: TIG Welding, Brass Welding, Copper Welding, Brazing alloys, Joining Dissimilar Metals, Stainless to Brass, Tom Lipton, Oxtool, Nothing too strong ever broke, Gas Tungsten Arc Welding

Id: qeeYojSYH90

Length: 23min 14sec (1394 seconds)

Published: Thu May 29 2014