Plasma Arc Welding (PAW) Explained

Plasma welding is an arc welding process that uses a plasma torch to join metals. The principle of this method is derived from GTAW aka TIG welding, where an electric arc is struck between the electrode and the workpiece.

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Let’s dig deeper and explore what plasma welding is all about.

What Is Plasma Welding?

Plasma arc welding (PAW) is a fusion welding process that uses a non-consumable electrode and an electric plasma arc to weld metals. Similarly to TIG, the electrode is generally made out of thoriated tungsten. Its unique torch design produces a more focused beam than TIG welding, making it a great choice for welding both thin metals and creating deep narrow welds.

Plasma welding is often used to weld stainless steel, aluminum, and other difficult metals compared to traditional methods. Similarly to oxy-fuel welding, this process can also cut metal (plasma cutting), making it a versatile tool for fabricators and manufacturers.

Plasma Arc Welding Process

The plasma arc welding process revolves around the principle of striking an arc between a non-consumable tungsten electrode and the workpiece. The plasma nozzle has a unique design feature, where the electrode is located within the body of the torch. This allows the arc plasma to exit the torch separated from the shielding gas envelope.

Additionally, the narrow opening of the nozzle increases the plasma gas flow rate, allowing for deeper penetration. While filler metal is typically supplied at the weld pool’s leading edge, it is not the case when creating root pass welds.

The complexity of the plasma welding torch sets it apart from gas tungsten arc welding. Plasma welding torches operate at very high temperatures, which can melt away their nozzle, making it a requirement to always be water-cooled. While these torches can be manually operated, nowadays, most modern plasma welding guns are designed for automatic welding.

The most common defects associated with plasma welding are tungsten inclusions and undercutting. Tungsten inclusions occur when the welding current exceeds the capabilities of the tungsten electrode and small droplets of tungsten get entrapped in the weld metal. Undercuts are generally associated with keyhole mode PAW welding and can be avoided by using activated fluxes.

Plasma Arc Welding Operating Modes

Three operating modes are used in plasma welding, wherein it can be operated at varying currents:

Microplasma (0.1 – 15A)

This operating mode can run arcs at low currents and remain stable up to 20mm arc length.

Microplasma welding is used to join thin sheets up to 0.1 mm in thickness, which is optimal for creating wire meshes with minimal distortion.

Medium current (15 – 200A)

The characteristics of the plasma arc are quite similar to TIG welding, but the arc is stiffer since the narrow opening of the torch restricts the plasma. We can increase weld pool penetration by speeding up the plasma flow rate, but this increases the risk of shielding gas contamination.

Medium current or melt-in mode offers better penetration than TIG and improved protection. The only drawback is that the torch requires maintenance and is bulkier compared to a TIG torch.

Keyhole mode (over 100A)

A powerful plasma beam is used to engage in high-current aka keyhole mode by increasing the gas flow and welding current. This mode allows deep penetration, using a single pass (up to 10mm thick for some materials) to create a consistent weld pool from molten metal.

Similarly to electron beam welding, the keyhole mode is great for welding thicker materials at high welding speeds. To guarantee satisfactory welds, filler material is generally added. Its welding applications include mechanised welding, positional welding, and pipe welding.

Comparison of Plasma and TIG Welding

Normally, a tungsten electrode is used in TIG welding to strike an arc between the torch and the workpiece. The plasma process works similarly but uses a different setup in its welding torch. The constricted nozzle design allows electrons to move at high velocities. This ionises the gas, creating a plasma jet with a high heat concentration, offering deeper penetration.

As plasma welding offers greater precision than TIG welding, it has a smaller heat-affected zone which is perfect for creating narrower welds. Ideally, plasma welding is a better choice than TIG welding, as it is an evolution of the latter. The technology behind its equipment allows it to run with lower current demand, better arc stability which leads to better stand-off distance, and better tolerances if the arc length is changed.

TIG welding however is a simpler method due to the complex parameters available for plasma gas welding. An operator would need extra training in order to transition from the already advanced TIG welding to PAW. And last, TIG welding equipment is cheaper and requires less maintenance than plasma arc welding’s sensitive and complex torch.

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Materials

Similarly to TIG welding, plasma welding is suitable for the majority of well-known metals, although it might not be the most cost-effective solution for some of them:

• Alloy Steel

• Aluminium

• Bronze

• Carbon Steel

• Copper

• Iron

• Inconel

• Lead

• Magnesium

• Monel

• Nickel

• Stainless Steel

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• Titanium

• Tool Steel

• Tungsten

Equipment

The key components of plasma welding equipment are:

Plasma torch

The unique design of the water-cooled plasma torch is the main distinguishing factor from other welding processes. Its operating principles have already been explained in previous sections.

Depending on the weld material and desired weld characteristics, different types of nozzle tips can be selected.

Control console

While conventional welding techniques directly connect a torch to a power source, plasma arc welding uses a control console between the two.

Some of the console features are the torch protection circuit, high-frequency arc starting unit, power supply for the pilot arc, water, and gas valves, individual meters for plasma, and shielding gas flows.

Power supply

Plasma arc welding uses DC power (rectifiers or generators) of at least 70 volts for open circuit voltage with drooping characteristics to have greater control in generating weld beads.

Gases used

• Plasma gas – exits the constricting nozzle separately from the shielding gas envelope and becomes ionised

• Shielding gases (argon, helium, hydrogen) – inert gas protects the weld from the atmosphere

• Back-purge and trailing gas – certain materials require special conditions

Wire feeder

Plasma welding may use wire feeders with a constant velocity that can be modified to run from 254 mm per minute to 3180 mm per minute.

Applications

Steel tubes

PAW is a great welding method in manufacturing steel tubes as it can be performed at high-speed welding with great metal penetration. Some industries prefer the plasma welding process to conventional TIG since its system is faster and uses less filler material.

Electronics

One of the welding parameters of the plasma welding process is it can run at low current modes. This mode allows small metal component welding, which deals with delicate materials sensitive to environmental factors.

Medical industry

Medical devices require precise components in order to run effectively. PAW is perfect for welding these components as it can reliably create a consistent weld bead.

Advantages of Plasma Welding

1. Can be operated in every welding position.

2. Fast travel speeds from concentrated heat input.

3. Keyhole welding allows for complete penetration.

4. Low current mode is suitable for thin and sensitive components.

Disadvantages of Plasma Welding

1. Expensive equipment and components.

2. Requires training and skill to create good welds.

3. Produces 100dB noise.

4. Creates ultraviolet and infrared radiation.

5. Water cooling is necessary because of high working temperatures.

6. Delicate equipment needs a higher amount of maintenance.

Plasma welding, or plasma arc welding (PAW), is used in many industrial sectors. A versatile and high-performance welding technique, the plasma welding process can be used to produce top-quality welds.

HARtech’s industrial welding professionals take a closer look at plasma welding, explaining how it works, what it’s used for and the benefits it offers. Learn how this innovative welding technique can help your business.

How plasma welding works

Plasma welding is an advanced welding technique that uses a high-temperature, ionized gas known as plasma to create and maintain an electric arc between a welding electrode and a workpiece. The intense heat generated by the plasma arc melts the base metal and filler material (if used) resulting in a strong and precise weld.

In the plasma welding process, an inert gas (e.g. argon) creates a protective environment around the arc and weld zone, which prevents contamination of the weld by oxygen from the air and guarantees a high-quality weld.

Common uses for plasma welding

Plasma welding is widely used in many industrial sectors. Applications include the automotive, aerospace, shipbuilding, industrial machinery design and petrochemical industries. Plasma welding is used to build pipes, tanks, metal structures, engine parts, cutting tools and more.

Since it can be used on different types of material, plasma welding is a highly sought-after welding technique. Plasma welding helps improve the productivity, quality and efficiency of various manufacturing and construction processes.

Stages of the plasma welding process

To perform efficient, high-quality plasma arc welding, a complete understanding of the plasma welding process is essential. Read on to learn more.

Preparing parts for welding

Before beginning the plasma welding process, it is essential to prepare all parts. This includes cleaning surfaces to remove contaminants such as rust, grease or paint residues. Chamfering or deburring may also be necessary, to make sure fusion and metal adhesion are successful and you obtain a high-quality weld.

Setting up plasma welding equipment

It’s time to set up the plasma welding equipment. This involves mounting the electrode, connecting the power supply and shielding gas cables, and checking all safety parameters. Plasma welding equipment generally includes a power source, a plasma welding torch and a cooling system.

Plasma welding parameters and settings

There’s one more step before you start welding. Adjust settings and parameters according to the material you are welding, the thickness of the parts and any welding specifications. You will need to verify electric current intensity, wire feed speed, shielding gas pressure, the distance between the electrode and workpiece, and other variables specific to your plasma welding project. A professional welder-assembler can guarantee the precision of settings and parameters for optimum metal fusion and penetration.

Creating the weld

The operator directs the plasma welding torch along the welding area, which generates an electric arc and intense plasma. The thermal energy of the plasma melts the base metals and filler material, forming a solid, homogeneous weld. The operator must use proper welding technique, control feed speed and maintain a constant distance between the torch and workpiece to achieve optimum results.

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