Experimental investigation on temperature distribution of molten pool for copper with blue direct diode laser cladding

Abstract

In order to clarify the mechanism of copper layer formation, real-time temperature measurement in the film formation process when forming a copper layer using a blue direct diode laser was performed using a thermal imaging camera. Pure copper is widely used for heat sink, electro-circuit and so on because of highly thermal conductivity and electro-conductivity. Although a thermal spray method and an electro less plating method are industrial applied for copper layer formation, these methods have some issues, such as low adhesive strength and poor layer. Therefore, we tried laser cladding method using a blue direct diode laser. We developed a laser cladding system using a 100 W class blue direct diode laser which converges the laser emitted from the six blue direct diode laser modules into one point by the multiple laser processing head. We have clarified that the cladding velocity depends on the scanning speed of the stage by forming a copper layer on a stainless steel substrate using the equipment we developed and observing the cross section of the copper layer. In this study, the mechanism of layer formation at the time of forming the copper layer was clarified by measuring the change in the temperature distribution at the time of forming the copper film using the thermal imaging camera in real time.In order to clarify the mechanism of copper layer formation, real-time temperature measurement in the film formation process when forming a copper layer using a blue direct diode laser was performed using a thermal imaging camera. Pure copper is widely used for heat sink, electro-circuit and so on because of highly thermal conductivity and electro-conductivity. Although a thermal spray method and an electro less plating method are industrial applied for copper layer formation, these methods have some issues, such as low adhesive strength and poor layer. Therefore, we tried laser cladding method using a blue direct diode laser. We developed a laser cladding system using a 100 W class blue direct diode laser which converges the laser emitted from the six blue direct diode laser modules into one point by the multiple laser processing head. We have clarified that the cladding velocity depends on the scanning speed of the stage by forming a copper layer on a stainless steel substrate using the equipment we dev...