Microwave oven, welding machine, etc. According to relevant public information, strong signal interference sources such as microwave ovens, welding machines, trams or high-voltage power transformers will cause strong interference to wireless signal equipment and interfere with short-wave radio stations with wifi signals. Wi-Fi, also known as "mobile hotspot" in Chinese, is the trademark of the manufacturer of Wi-Fi alliance as the brand certification of products, and it is a wireless LAN technology created in the IEEE802. 1 1 standard.