Brazing flux studies
This presentation is the property of its rightful owner.
Sponsored Links
1 / 15

BRAZING FLUX STUDIES PowerPoint PPT Presentation


  • 123 Views
  • Uploaded on
  • Presentation posted in: General

BRAZING FLUX STUDIES. INTERNATIONAL BRAZING AND SOLDERING CONFERENCE ALBUQUERQUE, NEW MEXICO / APRIL 4, 2000. Presented By: Dr. Y. Baskin Superior Flux & Manufacturing Company Cleveland, Ohio. PURPOSE.

Download Presentation

BRAZING FLUX STUDIES

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Brazing flux studies

BRAZING FLUX STUDIES

INTERNATIONAL BRAZING AND SOLDERING CONFERENCE

ALBUQUERQUE, NEW MEXICO / APRIL 4, 2000

  • Presented By:Dr. Y. BaskinSuperior Flux & Manufacturing CompanyCleveland, Ohio


Purpose

PURPOSE

  • To study the effects of time, temperature, and flux formulation on activation and exhaustion temperatures, which determine flux activity ranges. The role of several different base metals and filler metals was also studied


Equipment

EQUIPMENT

  • Thermolyne 1500 Furnace - Maximum Temperature 1300° C

  • 30 Tempilstik Temperature Indicators -400° - 1200° C

  • Calibrated Pyrometer with Surface Probe

  • Timer

  • Balance


Base metals

BASE METALS

  • Mild Steel

  • Stainless Steel 316

  • Copper

  • Brass (70% Copper, 30% Zinc)


Filler metals

FILLER METALS

Bag-1

  • Composition: 45% Silver, 15% Copper, 16% Zinc, 24% Cadmium Melting Point: 618° C

    Braze 630 - Bag-21, SAE-AMS 4774

  • Composition: 63% Silver, 28.5% Copper, 6% Tin, 2.5% NickelMelting Point: 690° C

    High-Temp 095, SAE-AMS 4764

  • Composition: 52.5% Copper, 38% Manganese, 9.5% NickelMelting Point: 875° C


Fluxes

Boric Acid

Potassium Tetraborate

Potassium Fluoborate

Potassium Carbonate

Potassium Fluroide

Potassium Bifluoride

Sodium Tetraborate (Borax)

Silica

Potassium Pentaborate

FLUXES

Fifteen fluxes were used, including existing products and experimental, formulations. Compositions included the following raw materials:


Flux compositions in the pseudo ternary k b f

FLUX COMPOSITIONSIN THE PSEUDOTERNARY K-B-F

Atomic Percent Boron (Silicon

Atomic Percent Fluorine

Atomic Percent Potassium (Sodium)


Furnace calibration pyrometer base metals mild steel soak time 40 seconds

Furnace Temperature (°C)

100

151

200

250

301

350

400

450

500

551

599

650

702

750

800

850

900

950

1001

1051

1100

1150

1200

1249

1301

Pyrometer Temperature (°C)

97

148

196

247

300

351

399

448

500

547

596

650

700

748

797

849

899

950

998

1049

1100

1147

1200

1250

1302

FURNACECALIBRATION/PYROMETERBASE METALS: MILD STEELSOAK TIME: 40 SECONDS


Furnace callibration pyrometer mild steel 40 seconds

900

800

700

600

500

400

300

200

100

0

0

100

200

300

400

500

600

700

800

900

1000

1100

1200

1300

FURNACECALLIBRATIONPYROMETERMILD STEEL/40 SECONDS

1400

1300

1200

1100

1000

PyrometerTemperature (C°)

Furnace Temperature (C°)


Effect of time on flux activation temperature mild steel

1000

900

800

700

600

0

0

40

80

120

160

EFFECT OF TIME ON FLUX ACTIVATION TEMPERATURE/ MILD STEEL

Flux ActivationTemperature (C°)

Time, Seconds


Flux activiation temperature as a function of b f ratio 40 second soak tiime

7.0

6.0

5.0

4.0

3.0

2.0

1.0

0

0

700

800

900

1000

FLUX ACTIVIATION TEMPERATURE AS A FUNCTION OF B/F RATIO(40 SECOND SOAK TIIME)

B/F Ratio

Temperature (C°)


Flux exhustion temperture mild steel and stainless steel

FluxMild Steel (C°) Stainless Steel (C°)

1967967

210501067

310581092

412001200

511001150

611421167

711561142

811501158

912331158

1012331175

1111171117

1212331262

1312831280

1412671275

1512721250

FluxMild Steel (C°) Stainless Steel (C°)

1967967

210501067

310581092

412001200

511001150

611421167

711561142

811501158

912331158

1012331175

1111171117

1212331262

1312831280

1412671275

1512721250

FLUX EXHUSTION TEMPERTURE/ MILD STEEL AND STAINLESS STEEL


Flux exhaustion temperature as a function of b f ratio 40 second soak time

7.0

6.0

5.0

4.0

3.0

2.0

1.0

0

0

700

800

900

1000

FLUX EXHAUSTION TEMPERATURE AS A FUNCTION OFB/F RATIO (40 SECOND SOAK TIME)

B/F Ratio

Temperature (C°)


Conclusions

CONCLUSIONS

  • Flux compositions high in boron and low in fluorine generally exhibit better high temperature properties , whereas compositions low in boron and high in fluorine show better and more active low temperature properties, Difference s in raw materials and other chemical factors may account for the departure from a more linear relationship between activation or exhaustion temperature and B/F ratios.

  • Increased soaking time reduces flux activation temperature.


Conclusions continued

CONCLUSIONS (Continued)

  • Neither flux activation temperature nor exhaustion temperature are affected by the base metal used, as long as the stability range of the metal is not exceeded.

  • Similarly flux exhaustion temperatures are not affected by the filler metal used, as long as the stability of the filler metal is not exceeded.


  • Login