Laser Welding of Cobalt Chromium Alloys

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cobalt chromium alloys are used in many medical devices, especially total hip and knee arthroplasty. They are biocompatible, able to integrate new bone tissue and have good mechanical properties.

They can withstand high temperatures and are resistant to corrosion. They also have a strong tensile strength and toughness that allows them to be used in aerospace components and medical instrumentation.

Achieving optimal welding strength of laser welded cobalt chromium (Co-Cr) alloys was investigated using a pulsed Nd: YAG laser welder at different output energies. This study evaluated the tensile strength of both cast and fabricated cobalt chromium alloys before and after laser welding.

Increasing the input voltage and pulse duration of laser welding resulted in higher tensile strength and depth of weld. However, the use of an argon gas atmosphere reduced the welding strength of the cobalt chromium alloys.

Welding with lasers is a powerful technique for joining metals, but it can be difficult to achieve optimal welding strength. This study examined the optimum conditions of laser welding for cobalt chromium and gold alloys.

Laser irradiation was performed at voltages of 150 V and 170 V with pulse durations of 4, 8, and 12 ms. The welding strength of the cobalt chromium and gold casts was significantly enhanced when the voltage was set to 170 V and the pulse duration was 8 ms. The resulting tensile strength was 38% greater than that of the cast without laser welding. This is a good result for laser welding, but it could be improved by further optimizing the voltage and pulse duration.