Aufhauser LayerMet (a silver-copper-silver "sandwich") should be used to braze large carbides to steels or stainless steels. By "large" we mean greater than 0.5 sq. inch (12.7 mm²). When brazing with LayerMet, the silver on each side of the sandwich bonds with the carbide and the steel. The copper in the middle (which melts at a higher temperature) acts to relieve the stresses caused by unequal rates of thermal expansion of the joined metals.

Other filler metals may include nickel and manganese to aid in carbide wetting and strengthening the bond; zinc for galvanizing and corrosion protection; and cadmium for lower working temperatures with higher mechanical strength and higher wear-resistant joint.

APPLICATIONS

Aufhauser LayerMet is ideally suited for joining pieces with a surface area of at least 0.5 sq. inch, such as diamond and carbide cutting blades; bulldozer, snow plows, and earth grader heavy duty blades.

GENERAL INFORMATION

CHEMICAL COMPOSITION

	Silver	Copper	Zinc	Nickel	Cadmium*	Total Other
LayerMet A-40Ni2	40	30	28	2	0	-
LayerMet A-49NiMn	49	16	23	4.5	0	7.5 Mn
LayerMet A-50Ni2	50	20	28	2	0	-
LayerMet Cd-50Ni3*	50	15.5	15.5	3	16	-

 

ADDITIONAL INFORMATION

PROPERTIES AND SPECIFICATIONS

	Liquidus	Solidus	Brazing Range	AWS	Form
LayerMet A-40Ni2	1435 °F / 779 °C	1220 °F / 660 °C	1485-1535 °F / 807-835 °C	BAg-4	Strip
LayerMet A-49NiMn	1290 °F / 699 °C	1260 °F / 682 °C	1340-1390 °F / 727-754 °C	BAg-22	Strip
LayerMet A-50Ni2	1305 °F / 707 °C	1220 °F / 660 °C	1355-1405 °F / 735-763 °C	BAg-24	Strip
LayerMet Cd-50Ni3*	1270 °F / 688 °C	1170 °F / 632 °C	1320-1370 °F / 716-743 °C	BAg-3	Strip

 

* Caution! Contains cadmium. Fumes are poisonous and can kill. Provide adequate ventilation and do not inhale gases and fumes. Read and understand American National Standard Z49.1, "Safety in Welding and Cutting" available from the American Welding Society. The use of brazing fillers containing cadmium may be restricted or banned in certain areas.

 

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