Robotics automation solutions have been introduced into various manufacturing processes and production lines to address labor shortages. When adopting robotics solutions, the fundamental challenge lies in achieving path planning with acceptable precision to meet manufacturing requirements. Therefore, the accuracy requirements of robots and the simulation-based path generation technique are crucial in machining applications. Calibration of the robot's end effector becomes the foundation for subsequent accurate path simulation generation and trajectory movement. This paper discusses the path generation strategy and calibration adopted in robotic welding applications. A cross laser device with innovative mechanical measurement design is used to calibrate the endpoint of the welding torch. Additionally, a lightweight and efficient integrated robot path generation and simulation software is developed. A tracking sensor is also integrated into the robot to generate precise welding paths, thereby assisting in addressing challenges and issues in welding automation.