The acid in your stomach is mostly hydrochloric acid. It dissolves aluminium foil easily and generates hydrogen gas in the process. If the foil was just a small piece there should be no problem so long as you do not burp near an open flame. Be careful defecating to because undissolved foil might come out crinkly.

Even if the maximum temperature is 400 degrees, the answer is probably not. Just like steel, aluminum alloys become weaker as the service temperature rises. But aluminum melts at only about 1,260 degrees, so it loses about half of its strength by the time it reaches 600 degrees.

When an aluminium rod is heated it expands and it also becomes luminous.

660 degrees Celsius

If you bend anything harder than 5054 aluminum, you will need to anneal it by heating along the bend line. When aluminum gets hot, first it is malleable, then it gets brittle, and then it melts. When you heat aluminum too close to the melting point and then try to bend it, the workpiece can crack or break.

To anneal a work hardened aluminum alloy, the metal must be heated to somewhere between 570°F to 770°F for a set amount of time, ranging from just thirty minutes to a full three hours.

Aluminium / Aluminum 6061 alloy is heat-treated at 533°C (990°F) for a sufficient period of time followed by quenching in water. The precipitation hardening process can be performed at 160°C (320°F) for 18 h followed by air cooling. This process is again repeated at 177°C (350°F) for 8 h followed by cooling in air.

Alloys not amenable to heat treatment, including low-carbon steel, are often work-hardened. Some materials cannot be work-hardened at low temperatures, such as indium, however others can be strengthened only via work hardening, such as pure copper and aluminum.

In other words, if you have a piece of 6061 aluminum that you’re welding, it’s heat treatable. If you’re working with 5052 aluminum, it is not heat treatable.

The Best Aluminum Alloys For Welding

• 1XXX alloys. This class of alloy is the closest to pure aluminum.
• 2XXX alloys. The 2XXX alloys are very strong.
• 3XXX alloys. This alloy class is of medium strength and is known to be very formable.
• 4XXX alloys.
• 5XXX alloys.
• 6XXX alloys.
• 7XXX alloys.

This involves two steps—solution heat treating and aging. Solution heat treatment is done by raising the alloy temperature to about 980 degrees F and holding it there for about an hour. The purpose of this is to dissolve all the alloying elements in a solid solution in the aluminum.

Simply put, aluminum is difficult to weld because it is a soft, highly sensitive metal insulated by a tougher oxidized layer. Aluminum is highly susceptible to impurities in its molten state, increasing the risk of ending up with weak, porous welds.

Aluminum Skill Level

Direct current is favored for TIG welding most metals because it penetrates deeply. Welding aluminum is one of the only times that alternating current is preferred. Alternating current, or AC, flips the polarity between standard and reverse quickly, from sixty to one hundred twenty times each second.