Alsom here is another way you can weld aluminum

Metal inert gas (MIG) welding can be successfully used to weld aluminum. … When choosing a shielding gas, 100 percent argon is best for MIG welding aluminum. The welder must choose a welding wire or rod that has an alloy as similar to that of the work pieces as possible to create a quality weld

Howe hot to weld aluminum depends on the  of the metal below im listing something  that can help

In general, GTAW power sources with an AC/DC output come in four categories, which are listed here in order of lowest to highest price:

1. Light fabrication. Machines designed for light fabrication usually have an AC output from 20 to 165 amps. While they do not incorporate a square wave output or balance control technology, they do produce an arc suitable for a variety of work, including applications for the home hobbyist.

2. Light industrial, maintenance/repair, metal fabrication. This newer class of light industrial machine provides roughly a 15 to 180 AC output and a professional-quality arc. Key features include: a square wave output, a fixed balance control set for more penetration than cleaning (a 60/40 electrode negative (EN) to electrode positive (EP) ratio works best for most applications), built-in high-frequency starting for positive starts without arc wandering, and a built-in stabilizer for a more consistent arc while welding.

3. Industrial production, fabrication, aerospace, repair. Industrial production GTAW power sources have a square wave output with an adjustable balance control. Greater amounts of EN create a deeper, narrower weld bead and better joint penetration. Greater EP values remove more oxide and create a shallower, wider bead. Transformer-rectifier GTAW machines can adjust EN values from 45 to 68 percent.

Machines are available with a variety of outputs, typically rated at 250, 350, and 500 amps with a 40 or 60 percent duty cycle. The low-end amperage range listed for these machines is usually 5, 3 or 25 amps, respectively. These power sources have created millions of code-quality GTA welds.

4. Inverter-based AC GTAW machines. Also considered industrial power sources, an inverter gives the professional welder more capability to tailor the width, depth and appearance of the weld bead for an application.

Inverters can adjust EN duration from 50 to 90 percent. Adding more EN to the cycle may: increase travel speed by up to 20 percent, narrow the weld bead, achieve greater penetration, permit using a smaller-diameter tungsten (to more precisely direct the heat or to make a narrower weld bead), and reduce the size of the etched zone for improved cosmetics.

Operators can adjust the welding output frequency in the range of 20 to 250 hertz. Increasing frequency produces a tight, focused arc cone. This narrows the weld bead, which helps when welding in corners, on root passes, and fillet welds; it also permits faster travel speed on some joints. Decreasing output frequency produces a broader arc cone, which widens the weld bead profile and provides greater cleaning action.

GTAW inverters accept single- or three-phase, 50- or 60-hertz, 230- or 460-volt input power. This provides flexibility when moving the machine between jobs sites or around a large facility. Using three-phase power and welding at 300 amps (460 volts primary), an AC/DC GTAW inverter requires only 18 amps of primary current. A 5- to 300-amp AC/DC GTAW machine weighs about 90 pounds

Friction stir aluminum welding