Jasic Evolve 200Jasic EVOLVE 200 Multi Process welding inverter. 5 YEAR WARRANTY. Pulse welding reduces the heat and minimises spatter, without compromising penetration, so its perfect for thin and soft materials like aluminium. A single pulse weld alternates between a peak current and a background current. Double pulse welding works the same way, but with a second background current to add even more control over the arc. Choose between two touch, four touch and spot