The Top 6 Tips For Welding Aluminum

When it comes to welding, one method doesn’t fit all. Certain qualities of aluminum can make welding a challenge. Leading east coast steel company and metal manufacturer Pennsylvania Steel Co. provides insight into the processing and production of construction materials. Below we offer professional advice for ensuring a safe and effective aluminum welding process.

Aluminum Characteristics

Commercial aluminum alloys offer impressive strength-to-weight ratios and corrosion resistance. These qualities make aluminum a desirable and practical engineering material.

Aluminum is available in numerous forms and grades. They differ in purity, hardness, ductility, thermal conductivity, and various other properties. In other words, aluminum exists in a vast range of types. Here are several commonly utilized grades:

  1. 1100 Aluminum (the purest form of aluminum commercially available)
  2. 3003 Aluminum (most frequently used in the industry, pure aluminum with an addition of manganese)
  3. 5052 Aluminum (excellent resistance against salt water corrosion)
  4. 6061 Aluminum (most commonly used aluminum alloy in construction)
  5. 6063 Aluminum (often referred to as the “architectural alloy” for its use in building structures)

The specific grade of aluminum speaks to its chemical composition. These attributes determine the material’s ultimate application and price point.

Can You Weld Aluminum?

You can weld aluminum, but standard welding methods can be unsafe and ineffective. Aluminum is highly sensitive, susceptible to impurities, and offers a small window of workability. Since pure aluminum is soft and malleable, adding various alloys creates its diversified range of types. Although the element naturally has a low melting point, the tough exterior oxide layer complicates the welding process. 

Why is Welding Aluminum Difficult?

Specific metal properties can make them challenging to weld. For example:

  • Oxidation: the chemical reaction that occurs at the surface of a metal when exposed to oxygen.
  • Porousness: measurement of permeability and other energy absorption properties.
  • Impurities: the presence of trace amounts of other elements.
  • Thickness: the metal’s “gauge,” expressed in mm (millimeters).

Physical properties vary widely in terms of aluminum grades and often present obstacles when welding. The following characteristics can make aluminum difficult to weld:

  • High thermal conductivity (resulting in high dissipation of heat)
  • Hydrogen solubility (causing excessive porosity)
  • Oxide layer (requiring thorough cleaning/preparation)

Types of Aluminum Welding

  • GTAW/TIG welding
  • GMAW/MIG welding
  • Laser beam and electron beam welding
  • Resistance welding
  • Shielded metal arc welding (SMAW)
  • Friction welding

6 Tips for Welding Aluminum

Pennsylvania Steel Co. specializes in metal processing services for commercial fabricators throughout the United States. We possess decades of expertise in the metal production industry. By sharing our expert knowledge, we strive to educate our valued clientele. Above all else, Pennsylvania Steel Co. values its partners’ and customers’ safety, loyalty, and trust. Properly and safely execute your next aluminum weld by following the expert advice we’ve provided below.

1) Clean and prepare your material thoroughly.

Proper preparation of your aluminum alloy is essential to effective welding. Cleaning and degreasing the metal beforehand removes the outer oxide layer. Adequate removal of this tough layer exposes the raw aluminum material, which has a much lower melting point. For reference, pure aluminum melts at 1200ºF while the oxide layer melts at 3700ºF.

2) Correctly store your aluminum materials. 

Adequately storing prepped aluminum prevents re-oxidation. As stated, the oxide layer is tough to remove. You want to avoid additional preparation and scrubbing.

3) Use a heat sink.

A heat sink is a supplemental component that absorbs or dissipates unwanted heat. The appropriate heat sink ensures optimized thermal transfer during the weld.

4) Tailor your technique for different building materials.

As previously mentioned, aluminum’s complex chemical structure can complicate welding as it’s highly sensitive. Before diving in, take the time to do your research, assess your materials, and refine your technique.

5) Always wear proper PPE.

Once again, we aim to educate and protect our clientele. As a result, we urge all of our fabricators to wear the necessary Personal Protective Equipment (PPE) when processing or working with any metal. When welding aluminum, for example, we highly recommend wearing a respirator!

6) Be patient and don’t rush.

Speeding through the welding process is undoubtedly dangerous. No matter how much PPE you wear, the best protection is practiced knowledge!

Allow the Pros at Pennsylvania Steel to Simplify the Welding and Production Process

Our goal at Pennsylvania Steel Company is the success of our valued clientele. We’re advancing this sustainable industry by sharing our expertise, providing superior customer service, and supplying metal fabricators all over the eastern U.S. Beyond our Bensalem, PA facility, we have warehouse locations in New York, Richmond, Virginia, Ohio, North Carolina, and more. We take pride in being a superior steel and pipe supplier and processor for manufacturing businesses throughout the U.S.

Our passion for advancing the steel trade stands over 50 years strong. Numerous industries – including the construction, defense, and technology sectors – rely on our experienced steel company as a vital source of premium metal production and processing services. We’re committed to facilitating growth – as a company, as an industry, and as a community. Request a quote or contact our metal specialists for inquiries regarding our product lines and services. 

How is Aluminum Made?

Although it’s the most abundant metallic element in the Earth’s crust, aluminum never occurs in its metallic form in nature. Its compounds, however, are present in nearly every form of vegetation, mineral, and animal.

When the silvery-white metal is isolated (first achieved in 1825), we wind up with the periodic element Aluminum (Al). Thanks to the modern method of producing aluminum, it surpassed copper in world production of nonferrous metals back in the 1960s. Today’s seamless process – electrolysis of purified alumina dissolved in cryolite – has allowed aluminum to remain widely used in several settings for decades.

Basic Properties & Structure

What is aluminum?

Natural aluminum compounds are universally present in igneous rocks and various gemstones. Ancient Egyptians and Babylonians used organic clay for assorted projects, including pottery, medicines, and textiles. It wasn’t until the late 18th century that experts recognized aluminum for its application as a metal.

The versatility of this metal is due to its ability to be combined with other alloys (ex: magnesium or silicon) in small amounts to diversify its applications. Although pure aluminum is malleable and somewhat brittle, commercial aluminum is very strong while still relatively flexible.

aluminum periodic table

What's the difference between aluminum and steel?

Steel is more rigid than traditional aluminum and is more durable because it’s more than twice as dense. Both steel and aluminum consist of a combination of two elements. Steel contains iron and carbon, while aluminum contains bauxite and cryolite.

Features & Manufacturing Process

What does the procedure look like for creating aluminum?

Stage 1: Finding the Ore

  • As previously mentioned, the metallic aluminum alloy doesn’t appear anywhere in nature. As a result, it can only be extracted from naturally occurring compounds.
  • Ore is the natural rock or sediment that contains one or more valuable minerals in the form of clay, slate, or granite sediments. The essential aluminum ore is bauxite. Bauxite is commonly found in deposits close to the Earth’s surface and contains about 52% aluminum oxide with iron oxide impurities.

Stage 2: Mining

  • Investigatory drilling allows geologists and researchers to determine the location of bauxite deposits for mining alumina. Once found, they extract the bauxite and remove the earth using various methods, including blasting, drilling, and ripping with specialized bulldozers. The resulting product is alumina: the raw, crystalline form of bauxite. 
  • Four tons of high-quality bauxite will produce approximately two tons of alumina, from which producers can manufacture about a ton of pure aluminum.

Stage 3: Refining the Bauxite (Using the Bayer Process)

  • In the first step of the Bayer Process (Digestion), the bauxite is ground, mixed with caustic soda, and pressurized. This step separates unwanted impurities and forms what is known as sodium aluminate.
  • The second step (Clarification) involves reducing the pressure, removing the separated impurities, and cooling the clarified solution.
  • In step three (Precipitation), the addition of aluminum hydroxide seed crystals results in precipitation, causing the aluminum to become solid.
  • The fourth and final step (Calcination) entails a thermal treatment process using rotary kilns. This heating method removes remaining impurities, and the subsequent material is the alumina or aluminum oxide.

Stage 4: Smelting

  • The last stage of aluminum processing is called smelting, also referred to as the Hall-Héroult process, invented in 1886. Smelting, which takes place in steel reduction pots, extricates the aluminum from the alumina.
  • The resulting molten solution – 99.8% pure – is poured into molds and cast. Subsequently, it can be alloyed with other metals or refined to create super pure aluminum (99.99%).

Why choose aluminum metal for my project?

If you’re trying to determine the appropriate alloy for your construction project, you may consider multifaceted aluminum for its many benefits:

  • Lightweight
  • Flexible
  • Impermeable
  • Recyclable
  • Odorless
  • Corrosion Resistance
  • Ductility
  • Electrical and Thermal Conductivity
aluminum supplier near me

Applications & Availability

What is aluminum used for?

Since this alloy is so versatile, its applications span enterprises and industries of all types. Some of the most recognizable aluminum functions include aerospace construction, food-processing equipment, household appliances, and electrical conductors. Because of its high corrosion resistance and conductivity, aluminum is ideal for manufacturing various consumer and commercial products.

Who supplies premium aluminum near me?

Are you looking for top-quality metal and alloy supplies near you? Pennsylvania Steel Company is the trusted manufacturer for premium metals all over the east coast and beyond – from Charlotte, North Carolina, and Long Island, New York to Cleveland, Ohio. The best aluminum supply company is your nearest PA Steel sales office, where our team is eager to provide you with superior materials for your next project. Contact our sales office in your area to receive fast, dependable customer support regarding local inquiries.

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