According to Baidu Encyclopedia, the welding technology major of HKUST does not involve radiation. Welding is a high-risk industry, and some jobs have potential occupational hazards, but this does not mean that welding technology itself will bring radiation. Welding technology usually needs to use electric arc to melt metal, which will produce certain electromagnetic field and radiation, but these radiation are usually within the limits stipulated by the state and will not cause harm to the health of welding operators and people around them.