Orbitalum ORBIWELD 12 Micro Orbital Weld Head

Narrow micro weld head for fittings in tight spaces

The Orbitalum ORBIWELD 12 (OW 12, code 821 000 010) is a closed orbital TIG weld head for tube from 3.0 to 12.7 mm OD. Its extremely narrow construction and liquid cooling let it weld micro fittings repeatably at currents that would overheat many heads of this size. It is used for gas and liquid lines in semiconductor fabs, aerospace systems, pharmaceutical plants and high-purity water supply, where lines run close together and clamping lengths are short.

A control panel in the aluminium handle passes weld commands to the power source, so no separate remote control is needed. Electricity, gas and coolant connections are integrated in the head, and the 7.5 m hose package with strain relief can be extended up to 20 m.

Technical specifications

Cassettes, inserts and productivity options

Removable clamping cassettes align the two parts precisely before welding and change without tools. Type A cassettes are stainless steel with a FlipCover that lets the operator check and correct the electrode position; one cassette is needed for each tube diameter, from 2.00 mm through 3.00, 3.18, 6.00, 6.35, 8.00, 9.53, 10.00 and 12.00 to 12.70 mm. Type B cassettes take aluminium clamping inserts, which lowers cost when many diameters are welded on standard tube.

The optional ORBITWIN switching unit connects two heads to one power source and lets them be used alternately, so one head can be loaded while the other welds. Other accessories include a table mount, ESG electrode grinders, the ORBmax residual oxygen meter, ORBIPURGE purging sets, hose package extensions and WS2 tungsten electrodes.

Electrode gap depends on cassette type and on whether a fitting or a plain tube is clamped, so the dimension table on page 2 of the datasheet should be followed when the gap is set with the supplied feeler gauge. As with any closed head, weld quality also depends on a clean square tube end, correct purge of the tube bore and a properly ground electrode, which is why a pipe facing tool, purge equipment and an electrode grinder are usually ordered together with the head.

Documents and quotation

The official manufacturer documentation is linked in the Datasheet & Documentation section at the end of this page. Browse Orbital Pipe Welding Systems for power sources and heads such as the Orbitalum P16 EVO.

For a quotation, list tube diameters, cassette type, hose length and the power source in use.

How the ORBIWELD 12 Works

The ORBIWELD 12 is a liquid-cooled closed orbital weld head from Orbitalum for small tubes from 3.00 to 12.70 mm outside diameter. The tube is clamped in cassettes and enclosed in a shielding gas chamber, while the rotor carries the tungsten electrode around the joint. Liquid cooling keeps the head at a stable temperature during series production, which supports consistent weld quality from the first joint to the last.

The control panel is integrated into the aluminium handle, so the operator can start the weld and move the electrode without reaching for the power source. Cassettes can be changed without tools. Two cassette types are available: Type A, a slim cassette with a flip cover for tight installation spaces, and Type B, which uses inserts to adapt to different tube diameters. The ORBITWIN option is also offered for the head.

ORBIWELD 12 at a Glance

Selection & Ordering Guide

To order an ORBIWELD 12 set-up, list the tube diameters you weld, choose Type A or Type B cassettes, and confirm the power source and cooling unit. Clamping inserts are needed for each tube size used with Type B cassettes. Our team can help confirm the correct ordering code.

Installation & Maintenance

Use high-purity argon, check the coolant flow before welding, and keep the clamping surfaces and gas chamber clean. Inspect and regrind tungsten electrodes to the correct geometry and length, and protect the head from impact when not in use.

Typical Applications in Oman & the GCC

Typical uses include instrumentation and hydraulic tubing, semiconductor and analytical gas lines, pharmaceutical and biotech systems, and high-purity water installations where small stainless steel tubes must be joined with repeatable, clean welds.

Because the head is closed and gas shielded, the inside and outside of the joint stay protected from oxidation, which is important for corrosion-resistant stainless tubing in hot and humid GCC conditions.

Why Source from Seven Star LLC

Seven Star LLC supplies Orbitalum orbital weld heads and power sources across Oman and the GCC. Request a quote with your tube sizes, and our team can help confirm the correct ordering code for the ORBIWELD 12.

Operators new to orbital welding benefit from the ORBIWELD 12 handle controls and quick cassette change, because set-up time between tube sizes is reduced and the risk of misaligned clamping is lower. Weld procedures can be qualified once and then repeated across a whole installation with the same power source program.

See also: Orbitalum ORBIWELD TP Open Orbital Weld Head.