FAQs

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 1) What is brazing?
 2) What determines a successful braze?
 3) What is annealing?
 4) What is the PuroBrite™ System?
 5) Why are atmospheres important?
 6) What is oxidization?
 7) Why is it important for the parts to be bright?
 8) Why continuous belt furnaces?
 9) Can stainless steel parts be brazed?
10) Can dissimilar metals be brazed?
11) Can brazing be used to join thin gage components with heavier components?

1) What is brazing?

Brazing is a metal-joining process whereby a filler metal is heated above its melting point and distributed between two or more close-fitting parts by capillary action. The filler metal is brought slightly above its melting (liquidus) temperature while protected by a suitable atmosphere. It then flows over the base metal (known as wetting) and is then cooled to permanently join the work pieces together with a metallurgical bond. Back to Top FAQ’s

2) What determines a successful braze?

There are eight variables that determine a successful brazed joint.

Four Pre-braze Fabrication Variables

  • Cleanliness of Parts
  • Gap Size
  • Part Design
  • Part Material

Four Brazing Process Variables

  • Placement of Alloy
  • Atmosphere
  • Process Time
  • Furnace Temperatures

Poor yields through brazing can be traced to deficiencies in one or more of the above variables.  Back to Top FAQ’s

3) What is annealing?

Annealing is a heat treatment process that removes work hardening stress from steel by restoring the grain structure. Annealing is commonly used as a treatment to prevent cracking in components exposed to cyclic and other stresses and for parts that will undergo further metal working processes. The PuroBrite™ process produces consistently uniform grain structures and clean bright finishes.  Back to Top FAQ’s

4) What is the PuroBrite™ System?

The PuroBrite™ system combines the purest atmospheres with precise heating, cooling, fabrication and preparation specifications. The PuroBrite™ system includes our unique efficiency system that enables us to guarantee you receive prompt deliveries. PuroBrite™ is especially suited to brazing and annealing stainless steels including 300 and 400 series alloys. PuroBrite™ can be relied upon to solve costly customer satisfaction entanglements for existing programs subjected to inferior processes. Startup costs are minimal with short lead times. Parts are always bright, always on time.  Back to Top FAQ’s

5) Why are atmospheres important?

Brazing and annealing work requires high temperatures, oxidation of the metal surface occurs in oxygen-containing atmosphere.  Oxidized surfaces form weaker bonds with the braze alloy and damage the corrosion resistance properties of stainless steels.  Atmospheres blanket the parts in the furnace. Only pure atmospheres support consistently high yields and accurate defect root cause analysis.  Back to Top FAQ’s

6) What is oxidization?

When metals are exposed to oxygen, oxides form from oxygen atoms that attach to the metal. The oxides that form prevent the molten alloy from metallurgically joining to the metal. Also, oxides can weaken or destroy the corrosion resistance properties of stainless steel.  Back to Top FAQ’s

7) Why is it important for the parts to be bright?

A bright finish on brazed and annealed parts is direct visual confirmation of the pre-braze cleanliness of parts and the quality of the atmospheres used. The brighter the part when it emerges from the furnace the better. Clean parts and robust atmospheres are required to achieve maximum strength in brazed joints. An absolutely bright finish also assures you that the corrosion resistant quality of stainless steel parts has been preserved and maximized. You can really see the difference.  Back to Top FAQ’s

8) Why continuous belt furnaces?

Continuous belt furnaces provide more uniform heating and cooling conditions versus batch processes. Process cycle times are shorter with minimal setup and changeover time and expense. The continuous furnace process generally requires no special tools, so startup  and maintenance costs are lower. Higher quality, efficiency, and shorter cycle times make the continuous furnace process the most  dependable source for OE applications. Continuous furnaces are an integral part of the PuroBrite™ system.  Back to Top FAQ’s

9) Can stainless steel parts be brazed?

Yes! The PuroBrite™ system is the best system for brazing and annealing stainless steel parts and is advantageous for joining dissimilar materials. PuroBrite™ is capable of producing bright 400 series stainless brazed and annealed parts.   Back to Top FAQ’s

10) Can dissimilar metal be brazed?

Yes. This is a natural advantage of brazing over other joining methods used for critical components. We regularly braze components with dissimilar base metals. Combinations of stainless and carbon steels are common. The PuroBrite™ process addresses these requirements as a part of pre-production planning. Back to Top FAQ’s

11) Can brazing be used to join thin gage components with heavier components?

Yes. Brazing is commonly used to join thinner gage components like tubing to heavier gage components like machined fittings. Often times these components are made from dissimilar base metals as well. Back to Top FAQ’s