23 4 2018 8 Vol. 23 No. 4 JOURNAL OF HARBIN UNIVERSITY OF SCIENCE AND TECHNOLOGY Aug. 2018 Q345B 1 " 1 2 2 2 1. 150040 2. 200125 Q345B 536. 47 MPa 281 HV Q345B DOI 10. 15938 /j. jhust. 2018. 04. 021 TG444 A 1007-2683 2018 04-0113- 05 Microstructures and Mechanical Properties of Q345B Steel Weld Joint Using Double- sided Arc Welding GAO Gui-li 1 MIAO Shen 1 2 CAI Chun-bo 2 ZHANG Hua-jun 2 1. School of Material Science and Engineering Harbin University of Science and Technology Harbin 150040 China 2. Shanghai Zhenhua Port Machinery Co. Ltd Shanghai 200125 China Abstract To solve the problem of incomplete penetration and the welding torch hitting the plate during the welding process of Q345B large thick plate by using robot double-sided arc welding the method of using no reserved-clearance root was proposed. The good forming weld joint was obtained by increasing the welding line energy and reducing the arc distance. The microstructure and mechanical properties of the welding joint were investigated according to the AWS D1. 1. The results show that the first weld pass of root consists of acicular ferrite and bainite and the second weld pass of root and filling pass consist of acicular ferrite and few of proeutectoid ferrite and the microstructure of fusion region consists of acicular ferrite and lath martensite and the coarse grain region consists of larger lath martensite. The average tensile strength of Welding joint reaches 536. 47 MPa and the tensile strength of welding is larger than fusion. Impact property of welding joint is good and the highest hardness reaches 281 HV. Keywords Q345B large thick plate double-sided arc welding no reserved clearance robot 2016-08 - 31 12531042. 1979. 1978 E-mail zhanghuajun@ zpmccx. net.
114 23 0 1-4 5-9 T K 45 10-3 - 5 mm 13 1 14-16 1. 2 1-2 mm Q345B 600 mm 200 mm 50 mm 600 mm 300 mm 50 mm 2 K 17-20 45 0 ~ 0. 3 mm 13 ~ 15 mm Q345B 25 3-5 mm JM-56 Φ1. 2 mm 82% Ar + 18% CO 2 1 2 3 130 ~ 150 Q345B 1 1. 1 1 FANUC M-10iA LINCOLN Power Wave i400 MAG 13-15 mm MAG 1 2 % C Si Mn P S V Nb Ti Cu Cr Ni Mo Q345B 0. 20 0. 55 1. 70 0. 040 0. 040 0. 02-0. 15 0. 015-0. 060 0. 02-0. 2 JM - 56 0. 08 0. 88 1. 52 0. 020 0. 015 0. 008 0. 20 0. 02 0. 021 0. 007
4 Q345B 115 2 R el /MPa R m /MPa A% A kv /J 20 Q345B 345 470 21 34 JM - 56 450 555 29 70 3 /mm /V /A mm /sec L /min 23 30 ~ 31 330-350 6 18-20 20 26 ~ 27 260-270 7 18-20 Q345B 4% 4 Q345B Phenom ProX 2. 2 5 5 a AWS D1. 1 5 b 4 30 mm 4 250 mm 50 mm 10 mm 4 180 38. 1 mm 3 5 c + 1 mm + 5 mm 55 10 mm 10 mm 5 d 3 2 2. 1 Q345B Q345B 4 3 a b c d 5
116 23 6 6a 6b 6c 6d 6e 7 281 HV 21 4 Q345B 536. 47 MPa 18. 4% 21% 4 / MPa % 1 534. 86 18. 2 2 535. 42 17. 5 3 542. 25 18. 1 4 533. 34 19. 8 536. 47 18. 4 a b c d e 6 2. 3 8 Q345B 7 8 7 5 5 223. 2 HV 174 J 197. 1 HV + 5 mm 9
4 Q345B 117 + 1 mm + 5 mm 1 J 2016 50 S1 47-50. 5 /J 20 104 86 96 96 + 1 mm 186 146 190 174 + 5 mm 132 168 130 143 a b + 1 mm c + 5 mm 9 3 4. J. 2002 1 5-9. 10 XIONG JUN LIU SHUYI ZHANG GUANGJUN. Thermal Cycle and Microstructure of Backing Weld in Double-sided TIG Arc Horizontal Welding of High-Strength Steel Thick Plate J. International Journal of Advanced Manufacturing Technology 2015 81 9 1939-1947. 1 13 174 J 2 Q345B J. 2013 4 30-35. 15. J. 2015 36 4 13-16. 16. J. 2012 33 3 37-40. 17 J. 2012 27 5 1-3. 3 Q345B 2011. 223. 2 HV 281 19 HV 197. 1 D. 2013. 20 J. 2002 12 24-26. 536. 47 MPa 18. 4% 21 21% J.. 2. J. 2010 8 32-36. 3. J. 2012 17 4 52-56. 5.. 2010 44 Sup 110-117. 6 NOWACKI J ZAJAC P. Mechanical Properties of Duplex Steel Welded Joints in Large-Size Constructions J. Welding International 2012 26 26 424-435. 7.. 2012 41 3 157-159. 8 AN GB PARK JS. Brittle Crack Arrestability of Thick Steel Plate Welds in Large Structure J. Metals and Materials International 2011 17 5 841-845. 9. J. 2011 32 1 25-28. 11 CHEN SHANBEN LV NANA. Research Evolution on Intelligentized Technologies for Arc Welding Process J. Journal of Manufacturing Processes 2014 16 1 109-122. 12. EH36 J. 2011 32 1 81-84.. TB19 J. 2010 20 s1 748-752. 14. HQ785T1 TIG TIG. K 18. D..... 2007 28 10 81-84.