This work is focusing on finding a suitable method for detection of the weak spot of back plate due to single electrode spot welding. Now a day, in automotive and other manufacturing process, the resistance spot welding technique became a successful joining method for different types of work. Here, we have used two types of sensors: temperature sensor and current sensor for detecting the weak spot. The system is expected to measure the correct welding current and temperature at spot welding for each set current. If the observed value of current and temperature is outside the specified range then there is more possibility for weak spot. This sensor system reads the value of current and temperature while welding and compares it with specified value. The measurement is displayed on the LCD display. If the observed value is outside the specified value then buzzer will get activated. These results are observed on computer with the help of Bluetooth wireless communication. © 2006-2019 Asian Research Publishing Network (ARPN).