Evolution of arc welding Design in welding MicroTack - Kemppi

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MicroTack tacking results in small, evenly sized tack welds in demanding jobs, such as in joining of materials with different thicknesses. 6 Kemppi ProNews 1 • 2008 ►►► According to him, MicroTack responds well to these increased quality requirements. The method is excellent for mechanised welding, as tacking spots made with MicroTack cannot be detected in the fi nished product, nor are there any holes burned by the large tack weld caps. Äikää emphasises the speed of MicroTack tacking and the time saved, which directly contributes to increased profi tability. He says: “For example, we weld the perpendicular bars of paper machines, which can be up to 13 metres long. This means that more than 50 metres of edges must be melted per bar, with tacks every 30 mm, totalling about 2000 tacks. In this scenario, saving just a split second per tack may yield signifi cant savings.” MasterTig is the ’horn of plenty’ of welding features “Although MicroTack has become the top feature of the new MasterTig machines, it is still just one good feature among many others. One must bear in mind that, as a whole, these machines represent the defi nite state of the art of AC TIG welding technology,” emphasises Mattila. According to Mattila, Kemppi’s new three-phase MasterTigs can provide all the functionality needed by a TIG welder, such as suffi cient welding current, both AC and DC welding, pulse welding, the Minilog feature, and remote control. “There are two control panel alternatives: ACS covers the basic functions, while the ASX option also features celebrated functions such as Minilog, MicroTack, and MIX TIG,” Mattila adds. The MIX TIG technology is another of the features that he wants to highlight. It is a welding technology suitable for aluminium materials, combining alternating current and direct current in a suitable ratio. Alternating current provides a good cleaning effect, while direct current guarantees good penetration. By adjusting the proportions of AC and DC, the welder obtains the perfect arc for easy welding of materials of different thicknesses while producing a smooth weld seam. █
Kemppi’s welding research – visions and innovation Welding technology research is the foundation on which Kemppi’s product development builds. Kemppi’s technology and research department continuously follows the development trends in the welding industry. Petteri Jernström, head of welding technology at Kemppi, describes the company’s welding technology research: The tight global competition keeps us alert at Kemppi’s technology department. The market always expects improved performance, reliability, and ease of use from new products. New products must also clearly stand apart from the competition in order to succeed. However, the development of each new feature requires a great deal of basic research, tests at the welding laboratory, analysis of pictures from a high-speed camera, and collaboration with welding customers and research institutes. The new features that make the practical welding work easier are always the results of a lot of work. The most recent example of innovations that facilitate welding work is the MicroTack tacking feature in the recently launched MasterTig MLS ACDC welding solution. The feedback we have received has shown it to be a fast and easy-touse method when there is need for high-quality tacking without welding deformation. The MIX TIG feature, for its part, in the same machine guarantees an optimal cleaning eff ect and effi ciency combination in aluminium welding under all circumstances. At the 2005 international welding exhibition in Essen, we introduced the fi rst ever applicationtailored arc for MIG/MAG welding of structural steel and stainless steels. The FastROOT special process, which initially had been developed for root welding, has since gained ground steadily in the off shore industry in particular. It is also well suited to welding of thin sheets. The second application-tailored arc was developed for the needs of robot welding. This AAA process is now known for its automobile industry welding and arc soldering applications. Both processes benefi t from spatter-free results and a heat input lower than that of the traditional short-arc welding. The pressure for developing new welding processes is still growing. For example, the steel industry is active in introducing increasingly strong steel types. The structures of mobile equipment, lifting equipment, and forestry and agricultural machines benefi t from strong steels in the form of mass savings, which can be directly transferred to the duty load and performance. This development favours lowheat-input welding mechanisms, as the heat cycle of welding aff ects the mechanical features of the joint less with lower heat input. Reduced heat input is also required for improving the rated and shape accuracy of structures. For example, a great deal of practical work is done at shipyards to minimise heat input, as deformations result in plenty of extra work, such as fl ame straightening, structure fi tup and fi xing, and deck underlayment in the outfi tting phase. The trend toward low heat-input welding naturally also guides the research and development done at Kemppi. In product development, the customer’s perspective is increasingly important. █ Petteri Jernström Welding Technology Manager Kemppi Oy Kemppi ProNews 1 • 2008 7
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Page 23 and 24: Take the faster route. FastROOT can
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Evolution of arc welding Design in welding MicroTack - Kemppi

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