Cut & Etch Weld Testing

For this video we’ll go intosome element on reducing and etching each carbon metal and aluminum welds let’s doit in a previous video and i will link it up right about here I experimented usingthis very equal technique for all positions flat horizontal verticaluphill and overhead I failed to get a danger to do a innovative scan forthat video but the puddle the arc seemed some thing like this I was looking to keepthe arc on the leading fringe of that puddle it regarded find it irresistible was penetratingokay but the one approach to know for certain is to test it this is just one ofseveral ways that you need to use for vertical uphill welding I observed it workspretty well also a series of triangles works however what each of them do is theykeep the arc in the entrance or main edge of the puddle so I failed to get achance to do a cut and etch for that special video and i made up our minds to position awhole bunch more passes on each and every one of these t joints here so I might also showthe cutting edge on how it’ll reveal lack of fusion or cold lap in betweenpasses so once we do the leading edge on this won’t only see the penetrationin the root of the joint or lack of penetration however will also see all thedifferent passes and the layers and the way they stack in there there are severaldifferent methods you should utilize to cut it’s simply best to make use of a system like a bandsaw or a chop noticed or whatever that offers you a quite smooth surface sothat you don’t must do a whole lot of grinding this dry cut saw leaves afairly tender surface so i’m going proper to the belt sander with a 50 grit beltthat will give me a satisfactory soft finish excellent flat finish not relatively smooth enoughto get detail in the etch so i’m gonna go ahead and go to a a hundred and twenty grit and that i’mgonna crisscross the scratches in order that i will comprehend once I bought the 50 gritscratches out of there that you may already variety of notice you’ll find a little bit bitof detail already on where the weld begins and the place it ends however i’m gonnago ahead and take it down a bit bit smoother commencing off with a brownscotch brite then stepping it all the way down to a pink scotch brite pad and then a gray oneand that should be about ample for etching i will be making use of thispassivation resolution made with the aid of a corporation known as chem clean. One more simpler to getsolution is solely naval jelly rust remover andI’ll show that in only a few minutes but you can find how this quite reallyreveals each and every weld nugget and the way so much penetration I acquired and in addition even eachlayer of weld and whether or not I bought ample fusion in between layers or whether Igot cold lap then I take a photo and that i pull it into some form of editingprogram and snap traces on it so i can inform the place the root of the joint is youdon’t want any super special modifying application to try this you would pull thisimage into whatever like Microsoft Paint even it might it would draw lineslike this I did an overhead multipass t-joint no longer too lengthy ago and just wantto exhibit you this can be a particularly tough finish nevertheless it’s still etched just finebest practice although is to get it just as gentle or as virtually a mirror finishas which you could with the gear that you’ve you’ll see extra detail if you get afine conclude in particular if you’re going to be using this Loctite naval jellyrust remover it really works just fine it takes a bit of bit extra swabbing to bring outthe detail but it does the job it can be effortless to get at any massive-box store and it alsohelps to as soon as you’re finished with the etch to form of play a light source atdifferent angles round it you can see more detail let’s take a look ataluminum now aluminum is really easy to cut and relatively effortless to etch some timeago I was checking out out specific waveforms on aluminum what you see hereis known as evolved pulse also called combined TIG where it can be alternating betweenAC and DC en i’ve examine all varieties of claims on how a lot penetration it gotI wanted to look for myself so I compared it in opposition to all of the different wave forms liketriangle wave delicate square evolved rectangular whatnot I cut this simply using ahand grinder and a reducing disc after which I polished it similar to common taking itall the best way all the way down to a blue or grey scotch-brite disc i labeled them so Iwouldn’t mix them up and you’ll find that the the predominant wave types liketriangle soft rectangular evolved rectangular we’re all very very similar but when Igot to that evolved TIG where it was once alternating between AC and DC en what adifference so I got to experiment it and notice for myselfthe difference in penetration alternatively of taking somebody’s phrase for it so then Ialso welded this quarter-inch lap joint by hand and that approach I might get an ideaof what it will do with filler steel brought and once more verified it obtained someresults in a matter of minutes I thought i’d weld one more quarter inch lapjoint using a 200 amp inverter laptop full pedal 200 amps quarter inch I’musing a giant 1/eight filler metallic and to me it looks like it’s not particularly getting inthere like there may be surely a little bit little bit of a void on there in the root ofthat joint i’m sort of packing filler steel in there I comprehend it’s now not as scorching asI would find it irresistible however for the purposes of simply correlating the puddle and the arcshot to the actual pass section I notion it might be interesting so I cutit with that equal dry reduce saw I went correct to one hundred twenty grit proper to the crimson wheelfollowed through the blue wheel or gray wheel after which i am gonna utilizing straight-upEasy Off oven cleaner for the etchant right here and it works simply best for aluminumdoesn’t take very lengthy both I’ve obtained a relatively just right polish on this now I received aresult and not only do i have a bit of bit of heterosexual-line outcome toward theroot of the joint but I acquired slightly bloodless lap out via the toe right here again Isnapped some lines once I pulled the image in to peer exactly where the rootof the joint is I bought some penetration right here and there however no longer what i might wantto see now this i do know just isn’t going to be just right so i am doing this on purposeI dropped the amps by 50 slamming some massive 1/8 rod in there and you will discover I’mtunneling i am getting lack of fusion on the root of the joint but we’re gonnasee exactly how so much cuz you just noticed that now you’re going to get to look thecross-section right here immediately no surprise thereI knew there was going to be some lack of fusion and didn’t comprehend i’d haveas a lot porosity as we see there but that is why we scan get loads ofinformation and one scan is valued at a hundred opinions you

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