The tenacity of heat-affected zone (HAZ) will decline and the size of grains will increase, because of the overheating on HAZ when submerged arc welding (SAW) is used to thick plate with high heat input. The shaping will worsen when SAW is used to thin plate with high current at high speed. A new SAW technology, the pulsed direct current (DC) automatic SAW, will be put forward in this paper in order to overcome the above shortcomings. And a pulsed controller with micro-controller unit (MCU) as the core, nixie tube (NT) and keyboard as the man-machine conversation interface is developed. The main functions of the pulsed controller include the output of pulsed welding current and the working with twin-wire. The research has widely prospects in application with significant meanings in theory and practical engineering.
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