Welding technique

Welding technique

Date 06/05/2019
Explosion Welding (EXW) is a method of welding in which a part of a weld will move at extremely high velocity due to an explosive reaction. It is commonly used to coat corrosion-resistant materials on carbon steels such as stainless steel, titanium, zirconium, nickel alloys.
 
The welding parts are arranged overlapping (may be parallel or tilted together), separated by a certain space. The upper metal plate will be covered with an explosive powder above it. An explosive reaction takes place that causes massive acceleration of the metal plate and makes it fly fast. Bang on the bottom metal plate.
This method is increasingly used because of certain advantages:
 
- Han has many different details, both the details are difficult to solder.
 
- Fasteners are not complicated.
 
- The welding process is simple.
 
- Can be used for welding large metal surfaces.
 
- Deep penetration depth, wide.
 
- Material properties are not changed.
 
- Just use small amount of explosive.
 
- Not too demanding on cleaning requirements after welding.
 
- This method is replaced in the case of not welding the metal hard by conventional methods.
 
However, the method of welding and welding has the following limitations:
 
- Only for metal parts with high impact resistance and high durability.
 
- Explosive reactions cause high noise and pressure, so high protection is required such as using a vacuum chamber system, underwater welding or buried under sand.
 
- The welders must have deep knowledge of explosives, the principles of welding safety and fire safety.
 
- Apply only to details with simple geometrical structure such as cone or tubular shape.
 
Applicability:
 
- Usually used to weld the pipe-like details.
 
- Good effect in application to welding parts with heat resistance, pressure as large as cylinders, pressure tanks.
 
- Suitable for welding in remote areas.
 
- To combine different details such as aluminum + steel, titanium alloy + chrome-nickel steel.
 
- Many applications in the shipbuilding and refrigeration industry.
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