Effects of distance between arc and heat sink on stress and distortion in DC-LSND welding technology

• 作 者: 李菊 关桥 郭德伦 杜欲晓 孙永春 史耀武
• 机 构: Beijing Aeronautical Manufacturing Technology Research Institute,Beijing Aeronautical Manufacturing
• 出 处: China Welding
• 发表日期: 2007年03期
• 关键词: welding distortion titanium tungsten welded workpiece numerically render compres

The characteristics of temperatures, stresses and strains fields have been studied numerically for a titanium alloy sheet welded with an improved gas tungsten arc welding method, in which a trailing spot heat sink is introduced to control the welding stress and distortion. The impinging jet model is employed to describe the intense heat transfer between the cooling media and the top surface of the workpiece. The influence of the distance between arc and heat sink is investigated. Results show that there is an ideal range of distance. Using the ideal distance, a low stress and no distortion welding structure can be derived.

The characteristics of temperatures, stresses and strains fields have been studied numerically for a titanium alloy sheet welded with an improved gas tungsten arc welding method, in which a trailing spot heat sink is introduced to control the welding stress and distortion. The impinging jet model is employed to describe the intense heat transfer between the cooling media and the top surface of the workpiece. The influence of the distance between arc and heat sink is investigated. Results show that there is an ideal range of distance. stress and no distortion welding structure can be derived.