Installation Guide

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BRASS

COPPER

WROUGHT

WROUGHT WROUGHT

WROUGHT

CAST

BAg

BCuP

during brazing, the flame should be

kept slightly ahead of the point of filler

metal application. Stop feeding as

soon as you see a complete fillet.

Horizontal and Verticle Joints

When brazing horizontal joints, it is

preferable to first apply the filler metal

slightly off-center at the bottom of the

joint, proceeding across the bottom of

the joint and continuing up the side to

the top of the joint. Then, return to the

beginning point, overlapping slightly,

and proceed up the uncompleted side

to the top, again, overlapping slightly.

This procedure is identical to that

used for soldering.

Also, similar to the soldering

process, make sure the operations

overlap. On vertical joints, it is immate-

rial where the start is made. If the

opening of the socket is pointing

down, care should be taken to avoid

Figure 14. Brazing Flux Recommendations

A1143-04/05

For further information about

soldering and brazing of copper tubes

and fittings, contact:

Copper Development Association Inc.

260 Madison Avenue

New York, NY 10016

Tel. 212/251-7200

Fax 212/251-7234

NOTICE: This publication has been prepared for use of journeymen plumbers, pipefitters, refrigeration fitters, sprinkler fitters, plumbing and heating

contractors, engineers, and others involved in the design or installation of plumbing, heating, air-conditioning, refrigeration and other related systems.

It has been compiled from information sources Copper Development Association Inc. (CDA) believes to be competent. However, CDA assumes no

responsibility or liability of any kind in connection with this publication or its use by any person or organization and makes no representations or

warranties of any kind hereby.

overheating the tube, as this may

cause the brazing filler metal to run

down the outside of the tube.

Removing Residue

After the brazed joint has cooled,

the flux residue should be removed

with a clean cloth, brush or swab

using warm water. Remove all flux

residue to avoid the risk of the hard-

ened flux temporarily retaining pres-

sure and masking an imperfectly

brazed joint. Wrought fittings may be

cooled more readily than cast fittings,

but all fittings should be allowed to

cool naturally before wetting.

General Hints

and Suggestions

If the filler metal fails to flow or has

a tendency to ball up, it indicates

oxidation on the metal surfaces or

insufficient heat on the parts to be

joined. If tube or fitting start to oxidize

during heating, there is too little flux. If

the filler metal does not enter the joint

and tends to flow over the outside of

either member of the joint, it indicates

that one member is overheated or the

other is underheated.

Testing

Test all completed assemblies for

joint integrity. Follow the testing

procedure prescribed by applicable

codes governing the intended service.

PURGING

Some installations, such as

medical gas and ACR systems,

require the addition of an inert gas

during the brazing process. The purge

gas displaces oxygen from the interior

of the system while it is being sub-

jected to the high temperatures of

brazing and therefore eliminates the

possibility of oxide formation on the

interior tube surface.

Purge gas flow rates and methods

of application should be included in

the Brazing Procedure Specifications

for these applications.

Guide Specifications

Properties

Builder Satisfaction Program

Soldering & Brazing

Application Handbooks

Water Supply and Distribution

Product Sources

Fuel Gas Distribution

How Tube is Made

50-Year Warranty

Medical Gas

Fire Protection

Air-Conditioning & Refrigeration

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