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　　The copper - zinc alloy filler metals are mainly adopted in the oxyfuel gas welding , high frequency welding , furnace welding , and used to braze the copper , copper alloy , steel , cast iron and hard alloy etc .
Before brazing , you must clear away all dirt very well on the brazed place and on the surface of object to be brazed such as greasy dirt , oxide and so on . The best brazed joints space is between 0.025mm to 0.1mm .In order to get good braze , you need make up the right flux in the process of welding .
The heat time should be shortest as possible and be avoided overheat so as not to the evaporation of zinc and the over -oxidation in the joint where will be formed the braze with many holes when these products are brazed in the oxyfuel gas welding .

The basic data of Copper-Zinc series filler metals

Brazing Alloys	Chemical Composition(%)						Melting Range℃		Working Temperature℃	Trensile σb N/mm2	Equal to foreign alloy standards
	Cu	Mn	Ni	other	Zn	All impurities	Solidus	Liquidus
BCu	＞99.9	/	/	/	Bal	＜0.1	1083	1083	1100~1150		U.S.A BCu-1
BCu58ZnMn	57~59	3.7~4.3	/	Fe0.15			880	909	935~960
BCu60ZnMn-R	59~61	/	/	Sn0.8~1.2 Si0.15~0.3			890	905	900~960	343
BCu62ZnNiMnSi-R	61~63	/	/	Sn0.1 Si0.1~0.3			921	935	880~900
BCu62Zn	50~52	/	/	Sn0.6~1.8 Si0.2~0.3			860	910	900~960	313
BCuZnNi	56~58	minute	9~11	Si minute			480	500	930~982		U.S.A RBCuZD
BCuZnNi		minute	4.5~55	Si minute			525	555	910~960