What's the salary of Shanghai Sany Heavy Industry welder now?

Wages here are calculated by quantity. When the company is profitable, the workload is large, which can reach 5000~6000/ month, and when the benefit is not good, it will be 2000~3000/ month. Food and accommodation are all in the company, the rent is 200, and the food is almost 500 a month. There are two shifts in our workshop, 8: 00 am-5:00 pm and 8: 00 pm-6:00 am.