Acknowledgements The authors greatly acknowledge the support from National Natural Science Foundation of China ( under Grant No. 50734004) and Shanghai Baosteel Group Corporation.
Three-wire submerged arc welding was utilized to weld a newly developed Zr-Ti microalloyed X120 linepipe with heat input of 21 kJ/cm. The microstructure in the heat-affected zone (HAZ), predominantly consisted of ba...