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A feature of Kemppi’s three-phase Mastertig MLS 3000 and 3003 AC/DC welding systems is the Microtack function, available on the optional ACX control panel.

This function has been specifically developed to tack weld carbon, stainless steel and titanium thin sheet components up to around 4mm thickness.

Microtack welding resembles spot welding in that it uses a high current pulse to create a low heat input to weld thin sheet materials and thin sheet to thicker sheet materials.

This method of TIG welding is made possible by the control technology used in the Kemppi power source, which creates a tailored current pulse that is efficient and fast, a matter of a few dozen milliseconds to create the low heat input.

The result is a clean, small tack weld, which is similar to a laser weld in appearance and characteristics, resulting in lower risks in burn.

Although Microtack welding is very fast and easy to use, it does not use any filler material and the heat input is low, so there is little tolerance for gaps, therefore precise joint preparation and fit up is necessary.

For example, for butt tacking a material thickness of 2mm the gap must be less than 0.2mm.

This function can be especially useful for thin material welding applications in the chemical, process, oil and gas industries as well as the pharmaceutical industry and food processing equipment manufacturing.

Other features of this function are minimum material deformation due to the low heat input, consistent small tacks, which cannot be detected after the seam has been welded, and the ability to be used with mechanised TIG welding.

Microtack welding can also speed up the tack welding of thin gauge beams, which could be up to 13m long and tacks every 30mm with the number of welds being as high as 2,000, any increases in welding speeds can have a significant impact on reducing production costs.

The Microtack function is available on the ACX control panel, which has all the features of the ACS basic panel for TIG welding, plus long pulse and synergic pulse functions.

The 4T Log function makes it easier to start and stop welding; Minilog enables the welder to switch between two current levels during welding by pressing the torch switch; a memory function stores previously used settings; and memory channels to store user-specific settings.

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