If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
You are hired as multi-talented welder, your mission is to finish all task as welder. Remember: Putting your safety first.
Use Your mouse left click then drag the weld torch with your mouse. Parts that need to weld is black lines with blinking dots. You can change your welding torch by clicking torch button on dashboard. Finish all black lines with blinking dots. You can inspect your work by clicking inspect button on dashboard,