Different filler alloys, which may both exceed the as-welded tensile strength of the base material, can be significantly different in shear strength performance. Corrosion Resistance A consideration for some environmental conditions and are typically based on exposure to fresh and salt water.
Sustained Temperature Services The reaction of some filler alloys at sustained elevated temperature above deg. This may promote premature component failure due to stress corrosion cracking. Color Match Base alloy and filler alloy color match after anodizing can be of major concern in some cosmetic applications. Post Weld Heat Treatment The ability of the filler alloy to respond to post weld heat treatment associated with filler alloy chemistry and joint design.
Using T6 tubing for hand railing that is to be clear coat anodized after welding. In this application we need to select the filler alloy that is going to provide us with the best color match after anodizing.
With color match as our prime consideration, the most appropriate filler for this application is alloy If we were to select filler alloy , , or , which are often shown as being suitable for this base material, we would find that after anodizing, our weld would become dark gray in color and would not provide a suitable match to the bright silver appearance of the hand rail tubing see fig one.
Fig 1 Using T6 extruded angle bar as a welded attachment bracket for a heating component that will be operating consistently at deg. In this application we would investigate those filler alloys that are suitable for elevated temperature service. We may consider , , or filler alloys, which are all suitable for temperature service applications.
Thu Apr 08, am Most agree that welding T6 will reduce it to just no heat treatment or at the very least an unknown degree of the strength would remain some suggest it gets some strength over time.
I've done a bunch of work on this lately as a part that I'm making for a project would have required post weld heat treatment if made with T6.
The filler rod specified was I convinced them that steel was fine in this application. It's not like I can find that filler at the local weld supply center. Thu Apr 08, pm Canuck, Thanks for the input, great point! The author of the article then goes on to state: "For this reason it is vital that all bicycles and handcycles that are made from aluminum need to be heat treated.
Some attention to the cross section of the surfaces at the hinge line is probably a good idea, although in the model world this technique can work successfully even with a butt joint. Lots of Sky Pups have been built. I HAVE heard that using this for the elevator can catch some dirt, though I bet a flexible hinge cover would solve that problem. Obviously one would want to do some strength tests for any particular installation. SkyPirate Active Member.
Mac Well-Known Member. Here is a nice paper about mechanical behavior of aluminium alloy welds, it's about T6 which is used locally as a equivalent to T6 at least in automotive industry or motor-sport, for billet uprights bell-cranks, etc.
At the back page you will find also some nice references for other papers. Tensile strength of welded joints of T6 Al alloy, under the experienced welding conditions, undergo a remarkable reduction of the initial value. Geek Well-Known Member. I realize this is an old post, yet this maybe interesting to those considering welding T6 aluminum and tempering: How to Weld Without Hot Cracking T6 is probably the most common aluminum alloy any of us encounter. In fact, , and all of the other alloys in the 6XXX series, are relatively sensitive.
All cracking in aluminum alloys is hot cracking. That is, the crack forms as the weld is solidifying and cooling. While other factors, such as joint restraint, can influence the tendency to hot crack, by far the most important reason for hot cracking is the chemistry of the solidifying weld.
Some chemistries are inherently resistant to hot cracking. Most of the 5XXX series fall into this category. For instance, if you were welding , you would probably have no problem welding it without filler metal. Such a weld is called an autogenous weld. However, the chemistry of , which is roughly 1. The answer is that we can weld it easily if we add filler metal of a very different chemical composition.
The weld will be an alloy of the filler metal we add and the parent material that gets melted into the weld. Did you ever wonder why there is no filler metal made? The reason is simple. If we made into filler wire, welds made using it would crack. It would be a really poor choice for a weld filler. Instead, we weld easily using either or filler metals.
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