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What is the ACW® method?

To put it briefly, it is a method of laser welding between resin parts of the same type to control the balance between laser transmission and laser absorption by resin material. In other words, this is absorbance control welding and we call it “the ACW® method.”
 
 With an existing laser welding method, as explained in the pages concerning laser transmission welding (LTW),
 (What is laser transmission welding?” “Features of laser transmission welding)
 one of the parts employs a laser-transmitting (non-absorbing) resin and the other employs a laser-absorbing resin.  A laser light is then radiated from the laser-transmitting resin side.
 
 The radiated laser light passes through the laser-transmitting resin, gets absorbed by the laser-absorbing resin, generates heat, and allows welding. At this point, a molten pool is formed on the welding interface. (Figure 1)
 
 
 
 As another existing laser welding method, laser absorption welding is available. As the principle of laser absorption welding, a laser absorption body is sandwiched between laser-transmitting materials and laser light is radiated from the laser-transmitting material side. The radiated laser light passes through the laser-transmitting resin, gets absorbed by the laser absorption body, generates heat, and allows welding. (Figure 2)
 
 
 
 However, laser transmission welding (LTW method) and laser absorption welding have some problems.
 
 - Laser transmission welding (LTW method)
 
 
 - Laser absorbing welding
 
 
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 To solve these problems, we have developed a new resin welding method called “the ACW® method” that makes it possible to conduct laser welding between resin parts of the same type by controlling the balance between laser transmission and laser absorption by resin material.
 
 As the principle of ACW® method, a laser light-transmitting/absorbing resin whose balance between laser transmission and laser absorption has been balanced is prepared, and then laser welding between resin parts of the same type is conducted.
The radiated laser light forms a molten pool inside the resin, and laser welding between resin parts of the same type is conducted. (Figure 3)
 
 
 
 
 
 The next page explains the Advantages of the ACW® method

 
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