What certificate does the person who installs the anti-theft net need to apply for?

You also need a welder's license to make a stainless steel anti-theft net. Without a welder's license, the stainless steel anti-theft net will not be welded, because the state stipulates that you must have a welder's license to operate electric welding and engage in electric welding. Therefore, even the stainless steel anti-theft net needs a welder's license, which is beyond doubt and is also stipulated by the state.