Soldering apparatus and welding machines, included in this class, namely, hot air soldering apparatus, hot air welding machines, hot air soldering pistols, automatic welding machines, in particular automatic hot air welding machines; control mechanisms for machines, including electronic mechanisms, in particular for welding machines; suction machines for industrial purposes; parts and accessories of the aforementioned goods, included in this class, in particular tuyeres, welding seam slides, ...