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Address: R&D building B-3, Xinma Industrial Park, Xianyue Road No.899
Tianyuan District, Zhuzhou City, Hunan Province, China
Tel: 0086-731-28706160
Mobile phone: 0086-177 7335 6163
Email: eason@est-carbide.com
Post code: 412000

Brazing Process

Process

Tungsten Carbide is brazed to steel to make saws, other tools and a whole variety of machine components called wear parts. 

Tungsten carbide is put on the tips or points of tools because it is very hard and stays sharper, longer than steel.    It is also used in areas where abrasion is a problem.  Tungsten carbide plates are used to line hoppers in cotton gins because the raw cotton will wear steel.

The tungsten carbide tip can be attached to the steel tool by brazing.  It is also possible to weld the materials and mechanical fastening is used where suitable.  In saws and drills the tips are brazed where stability of the tip is needed and room is limited.    Mechanical fastening is used in machining operations to allow for changing of inserts.  Welding is used on band saws where a very small piece of carbide is attached to a large piece of steel. 

Brazing can have real advantages over other forms of material joining.  It used to be thought that brazing a piece of carbide to a steel holder or saw body could damage the carbide. Originally brazing alloy was seen as just something to join the materials.   Research we did in the 1980’s showed that the alloy also has a definite effect in preventing breakage. 

Good Braze Joints Form a Composite

All three components were important.  All three parts (steel, alloy and carbide) actually form a composite material that has different properties than the individual components. This composite could create a lot more strength and impact resistance in the final assembly than was possible before.  In this case a saw tip on a properly brazed saw will survive a great deal more impact force than a saw tip on an anvil will.  

Four Parts to Brazing

Brazing carbide has four parts: the carbide, the brazing alloy, the steel tool body, preparing the surfaces and the process of putting it together. 

The Carbide

Poor quality carbide may have contaminants that make it weak.  It can be stressed which makes it brittle.  It can have surface contaminants, which can make it hard to braze.   The size may also vary which causes problems with grinding.  We sell only the highest quality of carbide.  Get a quote on quality Tungsten Carbide. 

Preparing the Carbide

An essential step in brazing carbide is to make sure the carbide is clean and that the surface is prepared properly.  You need a clean, prepared surface.   You can put brazing alloy on untreated carbide the same way you can paint over rust or dirt.  It works better is you have a clean surface. The surface must be cleaned, prepared and protected to make it suitable for use in today’s top quality tools. 

 The Brazing Alloy

Brazing is like brazing alloying.  It uses a material to join two different dissimilar materials.  Brazing is a high temperature process.  At these temperatures and with good alloys you actually create new metallic alloys that join the parts together.   

 There are many brazing alloys.  In carbide brazing the brazing alloys are typically high silver with copper, zinc, nickel and some other metal in them.  The standard alloy used to be 50% silver with Cadmium.  There are two problems with that.  Cadmium will kill you and it does not take very much to do it.  The government is coming down harder all the time on Cadmium contamination. 

There are various Cadmium-free brazing alloys.  There is a 50% silver alloy without Cadmium that works pretty well but not as well as the Cadmium alloy.  There is an alloy that is 56% silver with tin that seems to work well for some people but not for others.  The best available alloy now seems to be 49% silver with Manganese.  

It can make a tremendous difference which alloy you use. See our Article Choosing the right Braze Alloy. 

The Steel Body

The steel body must be very clean.  The big problems are oil and greases.  The residue from the gumming wheel can also cause a problem.  The best way to do this is to buy plate from a good supplier or to make sure that your plate shop is producing clean plate.

 


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  • Address: R&D building B-3, Xinma Industrial Park, Xianyue Road No.899
  • Tianyuan District, Zhuzhou City, Hunan Province, China