Research and Apply Automatic Submerged Arc Welding Technology to Weld Q345B High-Strength Low-Alloy Steel

Abstract

   Based on available equipments, an experimental model combining with equipment system, attachment and automatic submerged arc welding machine to weld Q345B high-strength low-alloy (HSLA) steel with T-letter shaped joint with a thickness of plates of 5 mm and 8 mm, respectively. Based on theoretic research on automatic submerged arc welding technology, experimental welding using experimental design and data processing were

performed to find out parameters for welding process of Q345B steel. Through the initial survey with constantparameters and experimental welding with input parameter intervals and evaluating output parameters, the following parameters of welding conditions were determined: welding current Ih ≈ 440 A and welding speed Vh ≈ 19.6 m/h. With parameters of welding conditions determined combining with technological elements and specific structure, T-letter joint welding produced good form, dimension and quality.