The new BMK-20i device model with efficient inverter technology is part of the successful SRM-EcoWeld® product line from Soyer and particularly suitable for welding large-diameter weld studs up to M16. As this unit has been specifically designed for an invariably high welding capacity even with uninterrupted continuous operation and only requires a mains connection of 32 A, it is a compact, robust and powerful aid for daily use, especially on construction sites. Due to its low weight of only 25 kg, this stud welding device can also be transported over longer distances without any problem. Further decisive advantages for the user are smooth and gentle welding even under challenging conditions such as out-of-position welding, the elimination of ceramic rings as aids, and no or only minimal reworking at the welded joint.