![]() ![]() 5: Aluminum Filler Elevated-temperature Service The filler metal is chosen primarily to be a match. In most cases, the base material the welder uses plays the biggest role in resisting corrosion. 4: Maritime Service or Corrosive Environments If a 4XXX series filler is used, the weld will become an unattractive black color after anodizing. 5XXX series filler alloys should be used in this case to provide the best color match. ![]() If desired, an organic dye can be infused into the coating later, providing a decorative wear surface on aluminum components. While the final anodized coating results in a clear satin color, some alloys may impart a slight color cast to the anodizing. This coating is very hard but porous enough to absorb organic dyes. Anodizing is an electrochemical process that produces a relatively thick coating of aluminum oxide on the surface of aluminum. In determining the proper filler metal in respect to weld appearance, welders should also consider whether the final part will be anodizedĪfter welding. In addition, these filler metals are less prone than the 5XXX series alloys to develop porosity in the weld. The 4XXX series, known as AlSi filler metals, have excellent fluidity, which gives an exceptional weld appearance and very good resistance to weld cracking. Some filler alloys have a greater tendency to produce a black, sooty residue on the weld surface, while others tend to be more fluid and easier to wet-in. 3: Weld Appearance and Aestheticsĭifferent alloys can provide a variety of finished-weld appearances. Different filler metals have differing tensile and shear strengths. In contrast, in lap or fillet welds, the shear strength of the weld is critical since the weld is usually stressed in shear. In groove welds, the tensile strength of the weld is critical as the weld is usually stressed in tension. When using aluminum, fabricators rarely obtain a weld that is as strong as the base metal. 2: Final Weld Strengthīoth the substrate and the type of weld can affect choice of filler material and ultimately weld strength. Therefore, the specified filler alloy plays a crucial role in determining cracking sensitivity. This chemistry is determined by the base metal, the filler metal, and the weld dilution. The solidifying weld’s chemistry is the single most important factor in determining cracking sensitivity. 1: Aluminum Filler Cracking SusceptibilityĪluminum cracking, commonly referred to as hot cracking, occurs as the aluminum weld solidifies. By considering the following application factors, fabricators can determine which filler alloy to use. The answer depends on the specific application and the filler characteristics that are most important for that application. Many fabricators faced with an aluminum project often wonder what the best filler metal is for the job. ![]()
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