Brochure

PH: 513-754-2000
THE HARRIS PRODUCTS GROUP
www.harrisproductsgroup.com
6
PH: 513-754-2000
THE HARRIS PRODUCTS GROUP
www.harrisproductsgroup.com
7
CUT TUBE SQUARE.
Cut to the exact length required using a tube cutter or hacksaw. If a hacksaw
is used, a sawing fixture should also be used to ensure square cuts. Remove
all inside and outside burrs with a reamer, file, or other sharp edge scraping
tool. If tube is out of round, it should be brought to true dimension and
roundness with a sizing tool.
CLEAN TUBE END AND INSIDE
SURFACE OF FITTING.
The joint surface areas should be clean and free from oil, grease, or oxide
contamination. Surfaces may be properly cleaned for brazing by brushing
with a stainless steel wire brush or by a stiff rubbing with emery cloth or
Scotch-Brite
®
*. If oil or grease is present, clean with a commercial solvent.
Remember to remove small foreign particles such as emery dust, by wiping
with a clean dry cloth. The joint surface MUST be clean.
SELECT BRAZING ALLOY.
Refer to the Filler Metal Selection Chart on page 32 for recommended
brazing filler metal selection. When brazing copper to copper, alloys such as
Dynaflow
®
, Stay-Silv
®
5, or Stay-Silv
®
15 are recommended. These alloys
contain phosphorus and are self-fluxing on copper. When brazing brass or
bronze fittings, Stay-Silv
®
white flux is required with these alloys. When
brazing iron, steel or other ferrous metals, select one of the Safety-Silv
®
brazing alloys such as Safety-Silv
®
45 or Safety-Silv
®
56 with Stay-Silv
®
white flux. Do not use phosphorus bearing alloys as the joint may be brittle.
PROCEDURES FOR
BRAZING PIPE AND TUBING
PROCEDURES FOR
BRAZING PIPE AND TUBING
Flux at brazing
temperature
Water boils out
FLUX BEHAVIOR DURING HEATING CYCLE
Flux bubbles
Flux begins to melt
Flux clear and quiet
50°F
1000°F
1500°F
2000°F
1225°F (663°C)
Safety-Silv
®
45
Solidus
1190°F (643°C)
Dynaow
®
,
Stay-Silv
®
15
Solidus
• 7 oz.
• 1/4 lb.
• 1/2 lb.
• 1 lb.
• 5 lb.
• 25 lb.
• 60 lb.
STAY-SILV
®
WHITE BRAZING
FLUX IS AVAILABLE IN THESE
CONTAINERS:
FLUX APPLICATION
White flux is used for most applications. Black flux is helpful for long heating
cycles or localized heating with induction. It is also used when brazing
stainless steel.
Flux goes through physical changes during heating and turns clear at
about 1100°F / 593°C. This is an indication that parts are close to brazing
temperature. Stir flux before use. If flux is dried out add a small amount of
water until flux reaches a paste consistency.
PERFORM PROPER FLUXING
Proper fluxing is important because the flux absorbs oxides formed during
heating and promotes the flow of the filler metal. When using Stay-Silv
®
white flux, apply it only with a brush. To prevent excess flux residue inside
refrigeration lines, apply a thin layer of flux to only the male tubing. Insert
the tube into the fitting and, if possible, rotate the fitting once or twice on the
tube to ensure uniform coverage.
*Scotch-Brite is a trademark of 3M