How to calculate the price of laser welding of combustion mould?

Laser welding, which is rarely used to calculate how much a square millimeter is now, is basically an estimate. I bought three welding machines that can emit lasers. As long as there is business, I will do whatever it takes, so the business is not bad. However, if the competition there is not fierce, it can also be calculated by area. At present, the price ranges from 20 cents to 1 yuan, which can be counted according to customers. Large area welding is generally calculated by volume. The price of area is half of volume.