2013 №04 (05) 2013 №04 (07)

The Paton Welding Journal 2013 #04
The Paton Welding Journal, 2013, #4, 34-36 pages  



1E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
2Siberian FederalUniversity, Krasnoyarsk, RF
Arc welding of parts from chrome-bronze is related with weld metal susceptibility to hot cracking. Given are the results of investigations on finding the measures for prevention of formation of hot microcracks in metal of chrome-bronze BrKh08 welds of large thickness performed by plasma-arc welding. It is shown that the main reason of defect formation in the weld metal is entry of air oxygen in plasma arc that results in intensive oxidation of chromium in a weld pool and transfer of weld metal to zone of maximum brittleness of Cu-Cr alloys. Considering that one slag coverage is not enough for large volume of liquid metal pool formed in plasma-arc welding over the flux layer using powerful modes (Iw = 1000-1400 A, Ua = 48-55V) in order to obtain quality weld, additional alloying of weld metal by chromium and small additions of titanium being efficient deoxidizer is concluded to be reasonable. Special filler wire of PPBrKhT 12-2 grade was developed for this purpose. Its application in combination with selected flux allowed successfully solving the task of industrial manufacture of moulds for metallurgical electro-furnaces. 9 Ref., 5 Figures.
Keywords: chrome-bronze, plasma-arc welding, solidification, structure, cracks
Received:                13.02.13
Published:               28.04.13
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