K-TIG is a single-pass, full-penetration keyhole welding technology which performs a
K-TIG is a GTAW process which requires no edge bevelling, uses as little as 10% of the gas normally required and produces highly repeatable, x-ray quality welds with superb cap and root aesthetics.
K-TIG welds meet US, European & Australasian welding standardsincluding ASME IX, and have been subjected to exhaustive Lloyds-witnessed and certified testing.
K-TIG has been exported to 18 countries and is being used in production by many of the world’s most productive fabricators in numerous industries from pressure vessels and tanks to power generation and nuclear applications.
K-TIG performs single pass, full penetration welds in a wide range of materials, including:
K-TIG’s incredibly fast welding times result in dramatic reductions in labor costs, welding cycle times, rework and repair costs, gas and power consumption. K-TIG's full-penetration welds significantly reduce or eliminate grinding, back-gouging & reworking. The K-TIG process eliminates the need for edge bevelling and dramatically reduces or eliminates the need for filler material. K-TIG requires only a simple square butt joint, and can also be utilised with all standard GTAW preparations.
Typical examples K-TIG welding speeds include welding of:
All in a full penetration pass.
These speeds are in the middle of the operating window for the K-TIG process and can be increased (in some cases significantly) if the objective is to optimise for speed, such as may be desirable in a tube mill application.
Keyhole TIG is a patented, high productivity GTAW variant which was originally developed by the Australian Government’s Commonwealth Scientific & Industrial Research Organisation (CSIRO), in conjunction with the Cooperative Research Centre for Welded Structures.
This simple process makes automated, high quality, deep penetration welding accessible to any small-to-medium sized fabricator.
This patented technology is based on extensive, scientific study of the gas-tungsten-arc process, and is the result of many innovations relating to arc characteristics, weld pool
K-TIG welding technology combines the high-quality and cleanliness of GTAW with a depth of penetration that is unmatched by conventional gas-tungsten arc, gas metal arc or plasma welding processes.
K-TIG uses self-induced effects to generate a plasma jet.
There is no orifice, making the process much simpler than plasma arc welding.
Just one welding gas is used, and its flow rate is not critical. The K-TIG keyhole has high inherent stability, and operates over a very wide range of welding currents. Setup is straightforward.
The K-TIG variant of the GTAW process is the solution to the weld pool instabilities which are characteristic of higher current GTAW welding.
A fundamental characteristic of the keyhole process is the intentional increase in arc pressure to the point where it extends the crater to the bottom of the pool. At this point, the bottom of the crater breaks through the root face of the weldment, forming a keyhole and allowing the arc gases to escape. Most importantly, the openings in the front and root faces of the weldment act to anchor the liquid surface of the pool. In helping to understand what this looks like, it’s helpful to visualise the elastic properties of a soap film bubble, as illustrated in the image to the right.
The minimisation of the surface energy associated with the keyhole geometry and the relatively unrestricted egress of the arc gases combine to produce a very robust and tranquil weld pool. Added to this, the molten metal within the weld pool is prevented from falling from the root face by surface tension, as evidenced above.
The K-TIG keyhole is unique because it does not rely on the very high energy densities of other keyhole processes such as laser and plasma, resulting in a wider fusion zone at the front face.
The K-TIG Welding System has been specifically engineered to deliver the Keyhole GTAW process in a robust, intelligent and extremely simple to operate system. K-TIG welding systems are produced in Adelaide, South Australia.
The complete K-TIG system is comprised of the following components: