Cold Welding

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Hello everyone ,This is Avsar from Turkey. We are manufacturer of diamond tools , core drills for concrete. We use silver brazing at the moment. I saw some core drills welded in a different way , neither brazing nor laser welding. I am told that the mothod is cold welding or cold fusion welding. Do you have any idea about this technology ? Who can we get in contact with ? We got in contact with Fronius company and EWM and they are working on it. Are we looking to tthe right direction ?We need a low temperature welding method with a good welding strenght enabling the dry usage of core drills.I am attaching a photo of the core drill which was welded with this method.Thank you in advance. Attached Images
Reply:Welcome to the forum Avsar.Lincoln A/C 225Everlast P/A 200
Reply:I'm not sure of the process that you're referring to.  I see a fair amount of the diamond blades/core drills for repair and none of them had a weld pattern that you pictured.  Next time I see the factory rep I deal with, I'll ask him.Out of curiosity, why are you looking to run those drills dry?  From what I've seen, that's just going to cause excessive wear and premature failure.BradFulcrum Saw & Tool
Reply:Dear Brad ,Thank you. The company is Rothenberger. They call this welding as "space welding" and claim that this is a stronger weld than laser welding and silver brazing as there is not excessive heat during the process. Also a company in France called Virax has some drills welded like this and they call it "cold segment fusion".Actually we need dry bits for some of our customers who work in hotels and hospitals in Turkey. They do not ask for long tools life , they just have to work dry.