Omni Technologies Corporation

Omni’s aluminum flux coated shim is a new innovative product for brazing difficult joint configurations. Omni’s flux coated shims can be used for any butt joints, saddle joints, or shraeder valves.

Aluminum flux coated shim eliminates pre-fluxing issues associated with conventional washers, pre-depositing of paste alloy, or a difficult wire feed operation.

Fixturing is no longer a problem as full pressure can be applied to coated shims for centering purposes.

Omni’s flux coated shim is AA 4047 aluminum brazing alloy coated on both sides with Nocolok® flux.

AA 4047 aluminum is the eutectic aluminum/silicon composition that melts over the narrow temperature range of 1070^oF-1080^oF (577^oC to 582^oC). Normal brazing temperature is 1080^oF-1120^oF (582^o to 604^oC).

SPECIFICATIONS

Alloy:

AWS A5.8 BAISi-4
Alcoa 718
AA 4047
AMS 4185

Nominal Composition:
88% AI - 12% Si

Melting Range:
1070^oF-1080^oF
(577^oC - 582^oC)

Nocolok® Flux:
K_1-3AlF_4-6

Melting Range:
1040^oF-1070^oF
( 560^oC - 577^oC)

Nocolok® flux and its residues are non-hygroscopic and non-corrosive, eliminating post braze cleaning.

Omni’s proprietary binder joins the flux to the metal with excellent adhesion, and vaporizes completely, well before brazing temperature, leaving no residue to interfere with brazing.

Omni’s flux coated shim is available in a range of alloy thickness, coated with the correct flux amount to meet your application.

Omni supplies flux coated shim in coils of strip, or punched out into custom preforms.

PREFORM OPTIONS

Flat, conical, or saddle shaped
Square, circular, oval, or custom shaped
With or without holes

OMNI TECHNOLOGIES CORPORATION
A Handy & Harman Company
195 Route 125
Brentwood, NH 03833
603-642-5310

© Omni Technologies 2004