• 1. experimental unit: Shougang Jingtang Company and Tangshan Heyuan Steel Pipe Co., Ltd.
• 2. experiment content: double-sided submerged arc welding experiment of stainless steel clad plate
• 3. test time: July 26, 2022
• 4. experimental site: Tangshan Heyuan Steel Pipe Co., Ltd.
• Participants in the 5. experiment: Shougang Technical Engineer Wang Fengwill (Doctor), Shougang Technical Engineer Wang Xiaoxia (Master),Shougang Liu LeiHeyuan General Manager Zhang Zhen, Heyuan Deputy General Manager Geng Yanfeng, Heyuan Technicaries Liu Longfei, Zhao Yi,Dong Shuqiang
• 6. welding process

　　Using 5 1mm thick Q235B 304 composite plate for double-sided submerged arc welding test, from welding assembly,The welding parameters (current, voltage, welding speed, etc.) and welding process were debugged and optimized, and the welding process was successfully completed.The pipe welding of 3 kinds of parameters composite pipe, the weld formation is good, no welding wear and porosity problems.

　　1. Welding test

　　Table 1 gives the process parameters of the welding test plate, in which the stainless steel side welding material is a 309 submerged arc of φ3.2mm.

　　Welding wire 601 flux, carbon steel side welding material is φ3.2mm 10Mn2 welding wire 101 flux. Figure 1 is a photograph of double-sided submerged arc welding.

　　Table 1 Process parameters of welding test plate

　　2. Joint analysis

　　After welding, the appearance and cross-sectional metallographic examination of the three-plan test plate were carried out. Fig. 2 Three scheme weld beadMorphology, Figure 3 is a three-program weld cross-section gold phase, Figure 4 is a stainless steel weld phase tissue. Table 2 givesThe measurement results of the weld bead size are obtained.

Stainless steel side bead appearance Carbon steel side bead appearance

Fig. 1 Photo of double-sided submerged arc welding

Fig.2 Three scheme weld bead morphology

1# test plate

2# test plate

3# test plate

Table 2 Weld bead size measurement results/mm

Fig. 3 Section metallographic phase of weld bead of scheme III

　　As can be seen from fig. 3, the weld beads intersect well under the three schemes, and the residual height of the two weld beads is moderate.

　　The observation of the gold phase organization of the stainless steel weld, the main element content of different positions of the welded joint was detected, Figure 4 is the gold phase organization of the stainless steel weld area, and Table 3 is the element content of different positions of the welded joint.

　　Table 3 Components of welded joints at different positions