Brazing Alloys

brazing alloys

the product lines

	Reference	Ag	Cu	Zn	Sn	Cd	P	Others
Cadmim-free alloys
	56 Sn	56	22	17	5
	55 Sn	56	21	22	2
	45 Sn	45	27	25	3
	40 Sn	40	30	28	2
	38 Sn	38	31	28.8	2.2
	34 Sn	34	36	27	3
	32 Sn	32	35	30.5	2.5
	30 Sn	30	36	32	2
Cadmim-bearing alloys
	50 Cd	50	15.5	16.5		18
	48 Cd	48	15	27		10
	45 Cd	45	15	16		24
	42 Cd	42	17	16		25
	40 Cd	40	19	21		20
	38 Cd	38	21	18.5		22.5
	35 Cd	35	26	21		18
	34 Cd	34	25	20		21
	30 Cd	30	28	21		21
	23 Cd	23	64.5	29		13.5
	20 Cd	20	39	29		12
	40 Cd Si	40	19	20.8		20		Si 0.2
	30 Cd Si	30	28	20.8		21		Si 0.2
	21 Cd Si	21	35.4	26.6		16.6		Si 0.4
Ternary alloys
	63 Ter	63	24	13
	53.5 Ter	53.5	31	15.5
	44 Ter	44	30	26
	25 Ter	25	41	34
	20 Ter Si	20	44	35.8				Si 0.2
Special alloys
	50 Cd Ni	50	15.5	15.5		16		Ni 3
	49 Mn	49	16	23				Ni 4.5 / Mn 7.5
	72 Cu	72	28
	68 Ni	68	25.5		6			Ni 0.5
	54 Ni	54	40	5				Ni 1
Phosphorus bearing alloys
	15 P	15	80				5
	6 P Ni	6	86.6				7.3	Ni 0.1
	5 P	5	88.5				6.5
	2 P	2	91.3				6.7
	1 P	1	92.5				6.5
	080 P		92				8
	078 P		92.2				7.8
	075 P		92.5				7.5
	068 P		93.2				6.8
	062 P		93.8				6.2
	07 P Sn		89		4		7
	06 P Sn		86.25		7		6.75

cadmium free alloys (56 Sn - 30 Sn)

	56 Sn	55 Sn	45 Sn	40 Sn	38 Sn	34 Sn	32 Sn	30 Sn
Physical & Chemical characteristics
Nominal composition in % Ag	56	55	45	40	38	34	32	30
Cu	22	21	27	30	31	36	35	36
Zn	17	22	25	28	28.8	27	30.5	32
Sn	5	2	3	2	2.2	3	2.5	2
Melting range (°C)	620-650	630-660	640-680	650-710	660-700	630-730	660-740	665-755
Density	9.5	9.2	9.1	9.1	8.8	8.7	8.6	8.8
Mechanical characteristics
Tensile strength in MPA	350	510	500	500	520	500	500	500
Elongation in %	25	11	14	17	18	20	20	18
Available forms
Wire
Rod
Flux-coated rod
Preform
Strip
Powder
Paste
Standards
AFNOR	56A1						32A1
AWS	B Ag-7			B Ag-28
BS		Ag14		Ag20				Ag21
DIN			L-Ag45Sn	L-Ag40Sn		L-Ag34Sn		L-Ag30Sn
Main properties
Narrow melting range
Excellent fluidity
Good capillarity action
Good gap filling properties

cadmium bearing alloys (50 cd - 34 cd)

	50 Cd	48 Cd	45 Cd	42 Cd	40 Cd	38 Cd	35 Cd	34 Cd
Physical & Chemical characteristics
Nominal composition in % Ag	50	48	45	42	40	38	35	34
Cu	15.5	15	15	17	19	21	26	25
Zn	16.5	27	16	16	21	18.5	21	20
Cd	18	10	24	25	20	22.5	18	21
Melting range (°C)	620-635	625-647	605-620	610-620	595-630	612-686	610-700	610-670
Density	9.2	9	9.1	9.1	9	9	8.9	8.9
Mechanical characteristics
Tensile strength in MPA	450	480	450	450	420	390	420	400
Elongation in %	35	26	30	30	30	28	29	30
Available forms
Wire
Rod
Flux-coated rod
Preform
Strip
Powder
Paste
Standards
AFNOR	50A1	48A1	45A1		40A1		35A1
AWS	B Ag-1 a		B Ag1				B Ag-2
BS	Ag1			Ag2	Ag10			Ag11
DIN	L-Ag50Cd				L-Ag40Cd
Main properties
Narrow melting range
Excellent fluidity
Good capillarity action
Good gap filling properties

cadmium bearing alloys (30 Cd - 21 Cd Si)

	30 Cd	23 Cd	20 Cd	40 Cd Si	30 Cd Si	21 Cd Si
Physical & Chemical characteristics
Nominal composition in % Ag	30	23	20	40	30	21
Cu	28	34.5	39	19	28	35.4
Zn	21	29	29	20.8	20.8	26.6
Cd	21	13.5	12	20	21	16.6
Si				0.2	0.2	0.4
Melting range (°C)	600-690	600-770	600-760	595-630	600-690	610-750
Density	8.8	8.6	8.5	9	8.8	8.5
Mechanical characteristics
Tensile strength in MPA	380	350	380	420	380	380
Elongation in %	30	30	32	30	30	32
Available forms
Wire	✔	✔	✔	✔	✔	✔
Rod	✔	✔	✔	✔	✔	✔
Flux-coated rod	✔		✔
Preform	✔	✔	✔	✔	✔	✔
Strip	✔	✔	✔
Powder	✔	✔	✔	✔	✔	✔
Paste	✔	✔	✔	✔	✔	✔
Standards
AFNOR	30A1					21A1
AWS	B Ag-2a
BS	Ag12
DIN	L-Ag30Cd		L-Ag20Cd
Main properties
Narrow melting range				✔
Excellent fluidity	✔			✔	✔	✔
Good capillarity action				✔
Good gap filling properties	✔	✔	✔		✔

ternary alloys (63 Ter - 20 Ter Si)

	63 Ter	53.5 Ter	44 Ter	25 Ter	20 Ter Si
Physical & Chemical characteristics
Nominal composition in % Ag	63	53.5	44	25	20
Cu	24	31	30	41	44
Zn	13	15.5	26	34	35.8
Si					0.2
Melting range (°C)	690-730	710-750	675-735	700-800	690-810
Density	9.5	9.3	8.9	8.5	8.4
Mechanical characteristics
Tensile strength in MPA	410	380	400	450	400
Elongation in %	30	25	25	15	20
Available forms
Wire	✔	✔	✔	✔	✔
Rod	✔	✔	✔	✔	✔
Flux-coated rod					✔
Preform	✔	✔	✔	✔	✔
Strip	✔	✔
Powder	✔	✔	✔	✔	✔
Paste	✔	✔	✔	✔	✔
Standards
AFNOR	63A1		44A1
AWS			B Ag-5
BS			B Ag-5
DIN			L-Ag44		L-Ag20
Main properties
Narrow melting range	✔	✔
Excellent fluidity	✔	✔	✔	✔	✔
Good capillarity action
Good gap filling properties			✔	✔	✔

special alloys (50 Cd Ni - 54 Ni)

	50 Cd Ni	49 Mn	72 Cu	68 Ni	54 Ni
Physical & Chemical characteristics
Nominal composition in % Ag	50	49	72	68	54
Cu	15.5	16	28	25.5	40
Zn	15.5	23			5
Sn				6
Cd	16
Mn		7.5
Ni	3	4.5		0.5	1
Melting range (°C)	635-655	625-705	778	675-753	713-857
Density	9.2	8.9	10	9.8	9.6
Mechanical characteristics
Tensile strength in MPA	450	550	350	350	400
Elongation in %	25	25	33	25	30
Available forms
Wire
Rod
Preform
Strip
Powder
Paste
Standards
AFNOR	50A2		72A1
AWS	B Ag-3	B Ag-22	B Ag-8		B Ag-13
BS	Ag9	Ag18	Ag7
DIN	L-Ag50CdNi	L-Ag49	L-Ag72		L-Ag20
Main properties
Narrow melting range
Excellent fluidity
Good capillarity action
Good gap filling properties

PHOSPHORUS BEARING ALLOYS (15 P - 080 P)

	15 P	6 P Ni	5 P	2 P	1 P	080 P
Physical & Chemical characteristics
Nominal composition in % Ag	15	6	5	2	1
Cu	80	86.6	88.5	91.3	92.5	92
P	5	7.3	6.5	6.7	6.5	8
Ni		0.1
Sn
Melting range (°C)	650-800	645-725	630-780	645-818	650-820	714-742
Density	8.4	8.2	8.2	8.2	8.2	8
Mechanical characteristics
Tensile strength in MPA	530	650	650	550	550	500
Elongation in %	10	8	8	6	6	2
Available forms
Wire	✔	✔	✔	✔	✔	✔
Rod	✔	✔	✔	✔	✔	✔
Preform	✔		✔	✔	✔
Strip	✔
Powder	✔	✔	✔	✔	✔	✔
Paste	✔	✔	✔	✔	✔	✔
Standards
AFNOR	50B1	07B3			07B2	08B1
AWS	B CuP-5
BS				CP2
DIN	L-Ag15P					L-CuP8
Main properties
Self-fluxing with copper	✔	✔	✔	✔	✔	✔
Good ductility	✔	✔	✔	✔	✔
Good capillarity action		✔				✔
Good gap filling properties				✔	✔

PHOSPHORUS BEARING ALLOYS (078 P - 06 P Sn)

	0.78 P	0.75 P	0.68 P	0.62 P	0.7 P Sn	0.6 P Sn
Physical & Chemical characteristics
Nominal composition in % Ag
Cu	92.2	92.5	93.2	93.8	89	86.25
P	7.8	7.5	6.8	6.2	7	6.75
Ni
Sn					4	7
Melting range (°C)	714-756	714-770	714-820	714-880	670-710	650-700
Density	8	8	8.1	8.1	7.9	7.9
Mechanical characteristics
Tensile strength in MPA	500	500	500	550	850	800
Elongation in %	2	3	4	5	15	1
Available forms
Wire	✔	✔	✔	✔	✔	✔
Rod	✔	✔	✔	✔	✔	✔
Preform			✔	✔
Strip
Powder	✔	✔	✔	✔	✔	✔
Paste	✔	✔	✔	✔	✔	✔
Standards
AFNOR	08B1		07B1
AWS		CP3		CP6
BS	L-CuP8		L-CuP7	L-CuP6
DIN	L-Ag15P					L-CuP8
Main properties
Self-fluxing with copper	✔	✔	✔	✔	✔	✔
Good ductility
Good capillarity action	✔				✔	✔
Good gap filling properties			✔	✔

BRAZING FLUXES

Reference	Acive range (°C)	Applications	Packaging	Packing (Kg)
Universal Fluxes
U1	500-800	Universal flux. Particularly recommended for steel.	Paste	0.15-1.2-9
U2 U25	500-750	Universal flux. Particularly recommended for stainless steels and cooper alloys.	Paste Powder	0.15-1.2-9 0.09-0.6-30
U3 U35	500-750	Universal flux. Particularly recommended for parts to be brazed in vetical condition.	Paste Powder	0.15-1.2 0.6-5
Special application fluxes
S1	500-800	Flux with boron. Recommended for the assembly of difficult stainless steels and refractory metals. Developed for brazing tungsten carbides with 50 Cd Ni brazing alloy.	Paste	0.15-1.1
S2	500-800	Especially for use with aluminium-copper and berryllium-copper.	Paste	0.15-1.2
S 45	550-750	Flux without boron. Used in nuclear applications.	Powder	0.6
H 15	600-900	For high temperature brazing and for the assembly of large pieces requiring prolonged heating. Recommended for brazing alloys with a silver content less than 20%.	Powder	0.1-0.6-5
FL 06	500-700	For delicate work using low melting point brazing alloys.	Liquid	1 Litre
AL 5	530-600	For the assembly of heat diffusing aluminium bases to stainless steel saucepans.	Power	5-20
AL 52	530-600	Can be used in paste form AL52	Powder	20

With the exception of the assembly of components in copper with copper-phosphorus alloys, all other brazing operations require the use of a brazing alloy in conjunction with a suitable flux. The purpose of the flux is:

to attack the surface of the metals to be joined, reduce any oxides on the surface and unable the brazing alloy to wet the surface,
to protect both the brazing alloy and the surfaces to be joined from oxidation during the brazing process.

The active range of flux must extend over the melting range of the brazing alloy chosen. The choice of the flux will depend also upon the metals to be joined. Fluxes are corrosive and strict attention must be paid to health and safety requirements.

brazing alloys

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Concept et design : Bosscom.lu - Développement : BMS Engineering