Paras Enterprises
Paras Enterprises
Mohkam Pur, Meerut, Uttar Pradesh
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Brazing Guidelines Continue

Brazing Guidelines Continue
   
1: Cut Pipe 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.

2: Clean Tube 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.

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 surfaces MUST be clean.
 
2: Select Brazing Alloy
 
When brazing Copper to Copper, low cost PE 15% may be used. These alloys contain phosphorus and are self-fluxing on copper. When brazing iron, steel or other ferrous metals, select a cadmium-free brazing alloy.

Do not use phosphorus bearing alloys as the joint may be brittle. To estimate the amount of brazing alloys needed, see Filler Metal Chart.

Proper Fluxing is important because the flux absorbs oxides formed during heating and promotes the flow of filler metal.  To prevent excess flux residue inside refrigeration lines , apply a thin layer of flux to only the male tubing and, if possible, revolve the fitting once or twice on the tube to ensure uniform coverage.
 
4: Assemble Tube and Fitting
 
Insert the fluxed tube end into the fitting. Maintain support to ensure the proper alignment until the brazing alloy solidifies. Maintain for a few seconds (or more) depending on the size of the joint area. The assembly is now ready to braze, using brazing alloy in rod, wire or coil form manually fed into the joint.

Adjust Torch Flames

For most brazing jobs using oxygen-acetylene gases, a ''neutral'' flame should be used. The neutral flame has a well-defined inner cone. Avoid an oxidizing flame.

Neutral Flame - Inner cone bluish white, no acetylene feather, tip Bluish to Orange.

Oxidizing Flame - Sharp inner cone bluish white, inner cone two-tenths shorter than cone of neutral flame, tip nearly colorless.

Carburizing (Excess Acetylene) Flame - Inner cone bluish white, acetylene feather bluish white with feathery edge, tip light orange.
 
5: Heating The Joint Area
 
Always keep the torch in short motion then.

Start heating the tube, first applying the flame at a point just adjacent to the fitting. Work the flame alternately around the tube and fitting until both reach brazing temperature before applying the brazing filler metal.

When a flux is used, it will be a good temperature guide. Continue heating the tube until the flux passes the ''bubbling'' temperature range and becomes quiet, completely fluid and transparent and has the appearance of clear water.

Direct the flame from the tube to the flange-base of the fitting and heat until the flux that may remain in the fitting is also completely fluid.

Sweep the flame back and forth along the axis of assembled joint...tube and fitting...to get and then maintain uniform heat in both parts.
 
Apply The Brazing Alloy
 
Feed the alloy into the joint between the tube and the fitting. Only after the base metals have been heated to brazing temperature should the filler metal be added. At that time the flame may be directed momentarily to the tip of the filler metal to begin the melting process.

Product Specification

Product Specification
   
Product  Specification
IS:2927  BS:1845  DIN:8513  AWS:A5.8
PE Copper Phos-A  BaCuP-2 CP3 L-CuP7 BCuP-2
PE Copper Phos-B BaCuP-1 CP6  L-CuP6
PE 2%  BaCuP-3 CP2  L-Ag2P BCuP-6
PE 5%  BaCuP-4 CP4  L-Ag5P BCuP-3
PE 6%  CuP-4
PE 15%  BaCuP-5 CP1  L-Ag15P BCuP-5
PE 20% Cd L-Ag20Cd
PE 25% Cd BAg-27
PE 25%  AG17  L-Ag25
PE 30% Cd BaCuAg-21 AG12  L-Ag30Cd BAg-2a
PE 30% 
PE 35% Cd BaCuAg-20 AG11  L-Ag34Cd BAg-2 
PE 40% Cd AG10 L-Ag40Cd
PE 40%  BaCuAg-18 BAg-4
PE 43% Cd BaCuAg-16A AG2
PE 43%  BaCuAg-16 AG5
PE 45% Cd BaCuAg-15 BAg-1
PE 45% BaCuAg-14 AG15 L-Ag44 BAg-5
PE 49% AG18 L-Ag49 BAg-22
PE 50% Cd BaCuAg-10 AG1 L-Ag50Cd BAg-1a
PE 50N-Cd BaCuAg-12 AG9 L-Ag50CdNi BAg-3

Chemical Composition

Chemical Composition
   
Product   Melting Range Applications
Solidus °c Liquidus °c
PE Copper Phos-A 710  802  For Copper or Brass 
PE Copper Phos-B 725 830 For Copper, flow is more sluggish 
PE 2% 643 788 Sluggish flow, used for copper joints with wider clearance
PE 5% 643 816 For Copper or brass. Used to bridge gaps where close fit can''t be maintained 
PE 6% 643 774 For Copper & Brass
PE 15% 643 804 For Copper & Brass. Good Ductility.
PE 20% Cd 603 755 Good filler forming properties.
PE 25% Cd 600 715 Good filler forming properties.
PE 25% 680 795 Moderate ductility limits joint design.
PE 30% Cd 610 700 Excellent capillary floe with better ductility for filling gaps.
PE 30% 690 760 Use with ferrous and non-ferrous base metals. Flow suitable bridging gaps.
PE 35% Cd 610 702 Good flow characteristics for wide range of application. 
PE 40% Cd 593 628 Good flow characteristics for wide range of application. 
PE 40% 660 779 Good flow characteristics. Suitable for ferrous & non-ferrous base metals.
PE 43% Cd 610 620 Excellent flow characteristics. Highest joint strength can be obtained.
PE 43% 688 765 Electrical Applications.
PE 45% Cd 605 620 Excellent flow characteristics. Highest joint strength can be obtained.
PE 45% 677 743 General purpose filler for steel alloys, copper alloys. Melting range useful for wide clearances. 
PE 49%  625 705 For brazing all kinds of Carbide-tipped tools.
PE 50% Cd 629 637 For Brazing Steels.

Product Characteristics & Applications

Product Characteristics & Applications
   
Product   Melting Range Applications
Solidus °c Liquidus °c
PE Copper Phos-A 710  802  For Copper or Brass 
PE Copper Phos-B 725 830 For Copper, flow is more sluggish 
PE 2% 643 788 Sluggish flow, used for copper joints with wider clearance
PE 5% 643 816 For Copper or brass. Used to bridge gaps where close fit can't be maintained 
PE 6% 643 774 For Copper & Brass
PE 15% 643 804 For Copper & Brass. Good Ductility.
PE 20% Cd 603 755 Good filler forming properties.
PE 25% Cd 600 715 Good filler forming properties.
PE 25% 680 795 Moderate ductility limits joint design.
PE 30% Cd 610 700 Excellent capillary flow with better ductility for filling gaps.
PE 30% 690 760 Use with ferrous and non-ferrous base metals. Flow suitable bridging gaps.
PE 35% Cd 610 702 Good flow characteristics for wide range of application. 
PE 40% Cd 593 628 Good flow characteristics for wide range of application. 
PE 40% 660 779 Good flow characteristics. Suitable for ferrous & non-ferrous base metals.
PE 43% Cd 610 620 Excellent flow characteristics. Highest joint strength can be obtained.
PE 43% 688 765 Electrical Applications.
PE 45% Cd 605 620 Excellent flow characteristics. Highest joint strength can be obtained.
PE 45% 677 743 General purpose filler for steel alloys, copper alloys. Melting range useful for wide clearances. 
PE 49%  625 705 For brazing all kinds of Carbide-tipped tools.
PE 50% Cd 629 637 For Brazing Steels.
PE 50 N Cd 634 688 For brazing tungsten carbide tips to rock drills, milling cutters, shaping tools etc.
PE 50%  688 774 Often used to  braze galvanized steel but suitable for bridging gaps in other ferrous & non-ferrous metals.
PE 55%  620 653 For use on Steels, Copper, Copper Alloys, Nickel & Nickel Alloys.
PE 60%  688 732 For brazing silverware or in step brazing operations.


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Amit Jain (Sales Executive)
36, Mohkampur Industrial Estate, Phase 1, Delhi Road
Meerut- 250002, Uttar Pradesh, India



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