Hot sale good quality OEM customed aluminum case SKC415R to Sacramento Factories
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From http://www.Weld.com and http://www.kevincaron.com – Wyatt “Mr. TIG” Swaim and artist Kevin Caron compare the requirements of structural vs. artistic welding … Swaim points out that, for artistic welding, you don’t need the high strength needed when, for instance, welding aircraft parts.
Caron agrees, pointing out that he does his structural work, then comes in and approaches the welding from an aesthetic perspective. In most cases, he creates an interior structure as a framework, then applies the skin of his sculpture. He wants to finish the sculpture in such a way that you don’t even see the weld or have to come in with a grinder and then have to clean up grinder marks. He just wants the welds to disappear.
They decide to start out by welding together two stainless steel plates, and the Voice points out they need to start by tacking them together. They’re going to create a corner joint with a fuse weld on the outside with a finished surface so there’s no clean up to do, then go to the inside, where the strength matters, and do a structural weld with good penetration so the outside joint won’t crack.
Swaim says it’s quite common to have two people work on this sort of project because, while tacking two pieces of metal together, it’s common for the back side to want to pull apart. So Swaim will be the “stainless magnet” for this video.
Swaim and Caron put on their welding gear. Using a 1/16, 2% thoriated tungsten at 70 amps with 100% argon gas, Swaim tacks one end of the outside corner joint, then the other of the two pieces of metal. Swaim points out that they are not using filler because stainless melts to itself very nicely, something that isn’t true with all metals. Without filler, though, the weld isn’t quite as strong because the throat of the weld isn’t quite as thick. If he wanted a neat pattern, he could turn on the pulse, but he just finishes the weld halfway down so he can come back with some filler material.
Now he adds some ER347 stainless filler, dabbing it consistently. Once again, he’s using DC negative at about 70 amps, 100% argon gas, and a 1/16 2% thoriated tungsten. He finishes the weld by backing off and adding a little more filler. He then holds the torch in place for five seconds.
Swaim and Caron note that the weld has a totally different texture, and Caron points out that if he came back with a 150 or 200 grit on a 4-1/2″ grinder and rounded the edges, the part that Swaim fused would end up with a little dish or divot, while in the area where he added filler, he could use the grinder to create a sharp edge, that come back and lightly grind it to soften the edge so you couldn’t even tell there was a seam there.
Next Swaim will turn over the piece and add a fillet weld. With it welded on both sides, it has real structural strength. They discuss that, when doing a fillet weld, you increase the amperage as much as 25%.
Swaim welds left to right, adding more of the ER347 stainless steel filler material with consistent dabs of the tungsten. Swaim points out that you can also use 308 filler for this application. Swaim continues to dab, getting down into the root. At one point, he gets a little out of position, so he backs off, then reinitiates the arc in his preferred position. At the end of the weld, Swaim adds a little more filler material, backs off the amperage and holds the torch in place. They then show the weld, with good fusion on both sides – this weld isn’t going anywhere!
Swaim lets the weld cool, then uses a deburring wheel to clean up both the weld with the filler and the weld without filler. The deburring wheel is a bit spongy that has a little grit in it to polish and deburr, so it doesn’t take off a lot of material, but it removes the surface scale and rounds the metal a bit. Then Swaim used a soft buffing wheel with a little green rouge to shine the weld it like chrome. Swaim says he can use the deburring wheel to remove all the ripples and give a perfectly smooth surface, but he only applied it for a few minutes in this case. Nonetheless, Caron points out that there are no grinder marks to clean up. While his deburring wheel is mounted on a bench grinder, Swaim says you can get the same wheels for a 4-1/2″ angle grinder, too. He says any industrial supply house should have them.
For more how-to videos, visit http://www.kevincaron.com and http://www.weld.com , where you can ask questions on the Weekend Warrior forum.
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By Jessie from Canberra - 2015.12.14 15:26
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By Evangeline from Bangladesh - 2015.05.15 10:52