The MTM-200 ST steelworks combination welding machine is a powerful 3-in-1 inverter with an output power of 200 A. It combines the TIG (DC), MIG/MAG and MMA welding processes in one compact device. It is also suitable for welding with cored wire (FLUX) and for precise employees working on thin sheet metal. However, it is not possible to weld aluminium. In MIG/MAG and flux mode, the automatic wire feed with selectable wire diameters (0.6/0.8/1.0 mm and 0.9 mm for cored wire) enables convenient welding. The spool mandrel is suitable for holding spools with a diameter of 16 mm or 50 mm, so that wire spools from 1 to 5 kg can be clamped. A powerful 4-roller drive ensures reliable and continuous wire feed, even with thicker welding wires. Infinitely variable voltage correction and adjustable arc width correction provide additional control over penetration, seam shape and wire burn-off speed. In TIG mode, the MTM-200 ST works with direct current (DC) and high-frequency ignition (HF). The 2T/4T mode and adjustable parameters enable very controlled ignition and finishing of the seam. 20-180 A are available for MMA operation, supplemented by hot start for easier ignition and anti-stick to prevent the electrode from sticking. The modern IGBT inverter technology ensures high performance with a compact design and low weight. Overheating protection, powerful smart cooling, ST-Guard housing and the VRD function (voltage-reduced idling in MMA mode) increase safety and reliability, even during intensive workshop use. This makes the MTM-200 ST a versatile all-rounder for professional applications in the trades and for demanding DIY enthusiasts.