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A study on design and structural strength analysis of a positioner in robot overlay welding system of a ball for ball-valves. Turning-unit of positioner modeled, analysis was conducted by assuming the beam. Turning-unit is applied to the stress, it was shown by 366.85㎫ when weight of the ball is 9,000  . This value is higher than the yield strength of the material. Based on the results of previous, it was modeled the turning-unit by modifying. Results of analysis by a modified modeling, The value of stress was confirmed to 296.11㎫. This value is a value lower than the yield strength of the material, it was found to support the weight of the ball.

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The analysis results of the temperature distribution and deformation at the PV cell with a thickness of 200㎛ according to hot-air temperature at the soldering process of a PV cell and ribbon tend to agree somewhat with the experimental measured values. The best result of the electrical efficiency appears in the module soldered at a hot-air temperature of 390℃. An analysis of the soldering PV cell with a thickness of 150㎛ at a hot-air temperature of 350℃ confirmed that the maximum deformation was approximately 5.9mm. As the temperature of hot air is set to decrease, the deformation is reduced and it is predicted that the electrical efficiency can be improved.