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Trimetals

WHAT ARE P&I TRIMETALS?

Trimetal shims & strip are essentially three-layer designs, with two outer strips of brazing filler metal clad onto a copper middle in a 1-2-1 ratio. 

Why Trimetals are Unique:

The copper core makes trimetals unique among alloys. Copper (Cu) withstands high temperatures, resists corrosion, and offers high electrical and thermal conductivity.  The outer “jacket” consists of a combination of common filler metals such as:

  • Silver (Ag), the standard for nonferrous and ferrous applications, provides versatility, high strength and low melting points,

  • Nickel (Ni) and Manganese (Mn) aid carbide wetting and strengthen the bond,

  • Cadmium* (Cd) affords higher mechanical strength and a harder, more wear-resistant joint; can also be used at lower working temperatures,

  • Zinc (Zn) is used in galvanizing and corrosion protection.

 
Trimetal

Trimetal Strip

 

Benefits of using P&I Trimetals:

Trimetals solve on of the most challenging problems in brazing, overcoming the differences in Coefficients of Thermal Expansion) between carbides and steels. Due to their unique ductile and durable properties, trimetals compensate for the stresses placed on carbide components during the joining process using the plastic deformation of the soft copper core.

Applications:

Trimetal shims and strip are ideal for joining large pieces with surface areas greater that 0.5 in2. Commong applications include carbide and diamond cutting blades, and heavy duty blades found on bulldozers, earth graders and snow plows.


*Cadmium is a known carcinogen and exposure to cadmium fumes may result in cancer and other hazardous side effects. Cadmium bearing alloys can be used for general purposes, joining large joint clearances and dissimilar combinations, joining ferrous and non-ferrous close fitting joints, and joining tungsten carbide tips and stainless steel. Typical applications include refrigeration and electrical components.

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