5-5. GMAW (MIG) Aluminum Welding Hints

Here are several hints to help you be more successful with your new aluminum feed system.

MIG welding aluminum requires different techniques than MIG welding mild steel.

A. Before You Start Welding

SThe removal of lubricants from the aluminum base material may be necessary. Consult with your local welding distributor for their recommendation on aluminum cleaners.

SOxide removal should be done after degreasing. This should be done with a stainless steel wire brush. This can be done with a hand wire brush or with a cup wire brush. If a power wire brush is used, keep the RPM’s and pressures low to reduce smearing the surface of the material, which could entrap oxides and impurities under the surface. Always use a wire brush that is used only on aluminum to keep from contaminating the base material.

SContact you local welding distributor or aluminum filler metal representative for recommendations on wire alloys that fit your application. Know the alloy of your base aluminum and what conditions the finished part will be subjected to. The two most readily available aluminum filler wires are ER4043 and ER5356.

B. Welding Techniques

SMake sure the welding power source is set up to weld DCEP (DC Electrode Positive).

SFor MIG welding aluminum you need to use a 10 to 15 degree push travel angle (tip and nozzle pointing in the direction of travel). See Figure 5-1.

Side View Of Gun Tip Angle

10°-15°10°-15°

Direction Of Welding

 

Forehand (Push)

Backhand (Drag)

Technique

Technique

Figure 5-1. Gun Tip Angle

SPulling or using a drag angle will produce porous, dirty welds due to a lack of gas coverage.

SThe reflective heat and weld puddle that is present when MIG welding aluminum is very hot. Holding the tip closer than 3/4 in. could lead to the wire burning back to the contact tip and other feeding problems.

SThe most common shielding gas for MIG welding aluminum is 100% argon. Flow rates of 20 to 30 CFH [cubic feet per hour (0.57 to 0.85 m3/hr)] are acceptable. C25 or argon CO2 shielding gases are not acceptable.

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Miller Electric OM-234 016D manual Gmaw MIG Aluminum Welding Hints, Before You Start Welding, Welding Techniques
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OM-234 016D specifications

Miller Electric OM-234 016D is a versatile and powerful machine designed for various welding applications. Known for its reliability and efficiency, this model integrates advanced technologies to cater to both professionals and hobbyists in the welding industry.

One of the standout features of the OM-234 016D is its inverter technology, which allows for a more compact and lightweight design compared to traditional welding machines. This technology not only enhances portability but also provides exceptional control over the welding process. The inverter system ensures stable arcs and precise welding performance, contributing to clean and consistent welds across different materials.

The OM-234 016D offers multiple welding modes, including TIG (Tungsten Inert Gas) and MIG (Metal Inert Gas), making it ideal for aluminum, steel, and other metals. The machine is capable of handling a wide range of thicknesses, making it suitable for various applications such as automotive repairs, fabrication, and light industrial work. The dual functionality allows welders to switch between modes effortlessly, adapting to specific project requirements with ease.

Another key characteristic of this model is its intuitive digital display, which provides real-time feedback on welding parameters such as voltage and amperage. This feature offers users greater control over their settings, enabling them to make precise adjustments on the fly. The machine also includes advanced arc stability features that minimize spatter and enhance overall weld quality.

Safety is a priority with the OM-234 016D, equipped with multiple safety features including thermal overload protection and input power monitoring. These functions safeguard the machine against potential damage and ensure optimal performance even under heavy-duty use.

Additionally, this welding machine is designed with user comfort in mind. Its ergonomic handle and compact footprint allow for easy transportation and operation in different environments. Whether working in a garage or on a job site, the OM-234 016D combines convenience with high-performance capabilities.

In summary, the Miller Electric OM-234 016D stands out as a robust option for those seeking a reliable welding solution. Its inverter technology, dual welding modes, user-friendly interface, and safety features make it an excellent choice for a wide range of welding tasks. This machine is a testament to Miller Electric’s commitment to innovation and quality in the welding industry, proving to be an invaluable asset for anyone looking to achieve professional results in their welding projects.
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