Introduction to Orbital Welding

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Introduction to Orbital Welding

Orbital welding is an automated process that ensures consistent, high-quality welds on pipes, tubes or round fittings. It works by rotating (orbiting) a Tungsten Inert Gas (TIG) electrode 360° around a stationary joint using computer controls. This “orbiting” weld delivers precise, uniform. Initially developed for aerospace, it’s now widely used in industries like pharmaceuticals, semiconductors, and food production, where weld quality and cleanliness are critical.

BLUF (Bottom Line Up Front)

What It Is: A fully automated welding process for pipes and tubes.

Why It’s Used: Ensures precision, consistency, and compliance with strict industry standards. It’s also faster than manual welding and easy to train.

Why not use it?: It requires consistent round joints, changing diameter of weld requires new collets. Applications: Aerospace, biotech, semiconductor manufacturing, and food processing etc.

Equipment: Requires a welding power supply and specialized weld heads (e.g., Donut Tools’ OW-ARC 180 and TPWH-C Series). Orbital welding offers a reliable alternative to manual TIG welding, delivering consistent results, faster operation, and detailed documentation for industries where weld integrity is non-negotiable.

How Orbital Welding works

Orbital welding is a variation of GTAW (Gas Tungsten Arc Welding) also known as TIG (Tungsten inert Gas) welding. This is a common high quality manual welding process in which a tungsten electrode creates heat while an inert gas (Helium or Argon) is used to protect the area from atmosphere and oxygen. The welder manually feeds in bare welding wire to fill a joint. Orbital welding takes the same principal, but instead of a human manually rotating a torch around a tube or pipe, a specialized weld head “orbits” a track around the tube. A computer controls the speed and settings to create a consistent and repeatable weld that is faster than a human can do it.

Key Equipment: 1. Welding power supply: Orbital welding uses special power supplies, these are similar to a normal GTAW power supply but also have a computer onboard to program and control the weld head

1. Weld Heads are the real brawn of the operation, they clamp around the joint and have a special track that allows a welding electrode to orbit around the tube or pipe.

2. Collets: The weld head uses precision machined collets that closely grip the tube or pipe. This provides a uniform clamp that won’t scratch tubes and also provides enough force to help align and keep joints together while welding. Each diameter of tube requires a different size collet.

3. Tungsten Electrodes: The current to melt the metal is carried by Tungsten electrodes, they are designed to stay only about 0.020”-0.050” (0.5-1.3mm) from the joint! Different shapes and sizes are used for different diameter and thickness tube or pipe.

Industries Using Orbital Welding

Orbital welding plays a key role in industries where precision and consistency are required.

Aerospace: it’s used for critical components like fluid lines, hydraulic systems, and structural parts made from materials such as stainless steel, titanium and aluminum.

Pharmaceutical, Sanitary Food, and Biotech: This welding method ensures sanitary, contamination-free joints. It helps meet tight cleanliness standards common in these industries. Specialized collets are also used to weld common sanitary fittings

Semiconductor manufacturing: Relies on orbital welding to create ultra-clean welds for gas and fluid delivery lines, especially in controlled cleanroom settings. The biggest users are semiconductor facilities which need miles of ultra pure gas lines to protect modern chips from contamination. It also won’t scratch the tube or introduce contamination like dust or dirt.

Other: Orbital welding can be used in any industries from hand rails, to oil and gas to cryogenic. If it’s a round joint and the need is in the hundreds to thousands orbital welding is a strong candidate for orbital welding.

Why Choose Orbital Welding?##

Orbital welding is fast consistent and clean. It doesn’t have a steep learning curve like manual welding so a new employee can make code quality welds in as little as 15 minutes. It works in any position and tight corners so it’s often used in machine repair or confined spaces.

When Not to Use Orbital Welding

Orbital welding needs consistent clean joints and doesn’t do well if the tube is not round. Therefore pipe that is dented or dinged may not work. Each joint has to be a very clean and precise fitup which welders may not be used to preparing, hand fabrication, large gaps and jagged edges won’t work for orbital welding. When the tube diameter changes a new set of collets and tungsten electrodes need to be installed which takes time and makes it less flexible. Each weld head can only address a certain diameter of tube so a large mix may require multiple weld heads. A Weld Head can cost over $10,000 so it’s an investment to have multiple. Which leads to the final point Weld heads and power supplies are expensive, the upfront investment may not make sense if only doing a small quantity. however Rental is an option in that case.

How Donut Tools Can Help You With Orbital Welding

Donut tools was founded by welding engineers and business owners who understand the needs in the field. We offer sales, service, repair, rental and custom parts for many brands of orbital welding.

Donut Tools Product Range A quick sample of Orbital related equipment include the OW-ARC 180 power supply and TPWH-C Series weld heads. The power supply comes with an auto-programming feature to simplify setup, while the weld heads are available with various collet sizes for precise tube positioning.

For tube preparation, Donut Tools provides a range of facing tools)

Donut Tools also offers the (Quick Cut Saw)[https://donuttools.com/c/463-orbital-tube-cutting-saw]. These orbital saws are designed to be used in house or in the field and quickly cut raw tube to length. This saw ensures true, burr-free cuts and features a self-centering vise, making it well-suited for high-purity environments.

Need additional help call us 916-573-7800 or e-mail us at sales@donuttools.com