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the workpiece can be rotated in a favorable position and high heat input is not a concern, submerged arc welding can become the process of the choice. Modified gas metal arc welding stands for high productivity and satisfying results, for decades it has been the unrivaled favorite when it came to overlay welding operations. But, due to the growing demand for improved welding quality and tighter tolerances, in many cases the use of GMAW is not possible any longer. Instead, mechanized TIG welding is increasingly applied to complete delicate tasks, especially after recent process developments which led to higher melting rates and enhanced productivity. Many companies use overlay


welding during the manufacturing of components for their own product range. Their cladding equipment is usually geared to their applications, and after years of experience they have gained sufficient knowledge to get


Figure 2: TIG-cladding of the inside of a small bore by means of a welding lance


reliable results. Subcontractors for overlay welding are forced to adopt a


completely different approach. These companies must react promptly on the requirements


of the market, the set-up of their overlay welding equipment for quite different workpieces must be


Figure 3: Arrival of the rough casting with a mass of 27 t in front of the new hall www.internationalmetaltube.com IMT December 2017 19


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