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Frequently Asked Questions about Silver Brazing

Frequently Asked Questions about Silver Brazing

  • Categories:Industry news
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  • Time of issue:2019-11-06
  • Views:6

(Summary description)Scientists and archaeologists have confirmed that brazing is one of the oldest methods of joining materials. Dating back to 1500-2000 BC, ancient brazing was first used primarily in the manufacture of jewellery and handicrafts, but in metals such as gold and silver, it was found that the welds existed in their natural form and produced new metals, and the alloys were Derived.

Frequently Asked Questions about Silver Brazing

(Summary description)Scientists and archaeologists have confirmed that brazing is one of the oldest methods of joining materials. Dating back to 1500-2000 BC, ancient brazing was first used primarily in the manufacture of jewellery and handicrafts, but in metals such as gold and silver, it was found that the welds existed in their natural form and produced new metals, and the alloys were Derived.

  • Categories:Industry news
  • Author:
  • Origin:
  • Time of issue:2019-11-06
  • Views:6
Information

Scientists and archaeologists have confirmed that brazing is one of the oldest methods of joining materials. Dating back to 1500-2000 BC, ancient brazing was first used primarily in the manufacture of jewellery and handicrafts, but in metals such as gold and silver, it was found that the welds existed in their natural form and produced new metals, and the alloys were Derived.

Nowadays, from home tools to high-tech aviation facilities, silver brazing has been widely used in various fields as a science. Silver brazing was originally a weld metal and metal alloy and has now been expanded for use in connection with metals other than metals, such as ceramics and cermets. When a new material or a new use of existing materials occurs, silver brazing often serves as the main welding work; in this regard, the operator or the person preparing to perform the brazing should understand the basic principles of welding, Used to assist in the selection of the right solder alloy to successfully complete the welding work. To help readers get more information on this, we have listed the following common questions and answered them:

1. How to distinguish between brazing and other welding methods?

By definition, the American Welding Society stipulates that the filler metal (solder alloy) melts above 450 °C below the melting temperature of the workpiece being welded, and the alloy fills the workpiece by capillary action and forms a joint that is brazed.

2. What is silver solder and brazing filler metal?

Both of the above terms are used to describe silver-containing solders, but they are all slang or non-standard representations. Soldering at temperatures above 450 °C is soldering, whereas soldering below 450 °C is soldering.

3. Is there any other metal other than silver that can be used as a filler (solder)?

Commonly used alloys are copper, copper phosphorus, nickel, aluminum and gold in addition to silver.

4. Why is silver solder so popular?

Because silver solder can be connected to many different metals, alloys and other materials, and silver solder has a lower melting temperature making it easier to use.

5. What is capillary action?

The American Welding Association stipulates that capillary action refers to the phenomenon that molten solder flows against the surface of a workpiece that is close to each other against gravity, and eventually forms a joint.

6. What will affect the capillary action?

There are many factors that affect the capillary action. The size of the gap in the soldering device is the main factor and the contact area of ​​the workpiece being welded.

7. What is the proper welding clearance?

For most standard types of joints, the filler metal is an alloy of silver and copper phosphorus, and 0.002-0.005 inches is recommended for weld clearance. Of course, if you have any questions, please feel free to contact our technical experts.

8. What is the common type of brazed joint?

There are three main types of welded joints: docking, lap and insert, and different combinations of the three joints.

9. What are the main factors affecting the surface energy of the parent metal?

Dirt and oxide

10. What dirt is included?

The most common contaminants are lubricants for drawing, cutting fluids, polishing agents, oils and lubricants.

11, how to remove oxides?

The use of flux in the soldering process is the most effective way to remove oxides.

12. Are there different types of fluxes?

Have. There are three main types according to the division of flux: chemical, reducing air and vacuum. When a copper-phosphorus alloy is used to weld copper and copper workpieces, phosphorus can replace the flux to remove oxides.

13. Can flux be used to remove other contaminants?

No. The flux is not a detergent, a solvent, a degreaser, and cannot be used to remove other contaminants.

14. Should the paste flux be removed after welding?

The cream flux should be removed. Because all paste fluxes contain fluoride, retention on the workpiece weakens the joint strength.

15. What is the importance of the heating process in the welding process?

Improper heating is a major problem with silver brazing and can affect the integrity of the joint.

16. What is the most difficult part of the heating process?

Knowing when the inner surface reaches a uniform temperature is the most difficult in the heating process because the operator cannot see the inner surface and it is difficult to measure the surface in mass production.

17. Why is uniform temperature important?

Capillary action is the mechanism of action of the filler metal to melt and form a joint. When the temperature under the entire capillary action area is uniform, the filler alloy (solder) can be drawn onto the hottest surface.

18. Uniform heating ensures filling of the solder alloy and forming joints?

no. Uniform heating alone is not sufficient to ensure that the brazing material flows smoothly and eventually forms joints. Brazing is accomplished by a variety of techniques. The operator's expertise is important for soldering a good joint. In addition, there may be areas where the capillary action does not reach uniform heating, in which case the solder is drawn to the nearest mating surface under capillary action.

19. What is the difference between silver solder and silver-containing copper-phosphorus alloy?

Copper-phosphorus alloys (with or without silver) are not as widely used as silver solders. They are mainly used to weld metal materials with copper as the base material. The phosphorus element in the copper-phosphorus solder also acts as a flux. Silver solder can be used for metal welding of copper and phosphorus alloys, and can also be used for workpieces with other metals as base materials.

20. In addition to copper, are there other base materials for copper-phosphorus alloys?

Copper-phosphorus alloys can also be used for the connection of brass, silver, tungsten and molybdenum. However, these materials require soldering to complete the soldering.

21. Why is copper-phosphorus alloy not suitable for iron and nickel for welding of parent metal?

Iron and nickel react with phosphorus-producing metals to produce brittle phosphides and weaken joint strength.

22. What is the solid phase temperature and liquid phase temperature?

When brazing, when the solder reaches a certain temperature, melting begins to be the solid phase temperature; when the alloy reaches a certain temperature and completely becomes liquid, it is the liquidus temperature.

23. What is eutectic/eutectic?

Eutectic/eutectic is a term used to describe the transformation of an alloy into a liquid when the alloy or temperature reaches a certain temperature. The common silver eutectic alloy contains 72% silver, 28% copper, and a eutectic temperature of 1435F.

24. What factors should be considered when choosing silver solder?

Workpiece materials, heating methods, automation, strength, internal pressure, operating temperature, corrosive environment / media, fluxing, ductility, conductivity and cost are all important considerations. For more information, please contact our technical experts.

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