Forming characteristics and control method of weld bead for GMAW on curved surface
The International Journal of Advanced Manufacturing Technology (2021)Cite this article
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Abstract
곡면에서 GMAW 기반 적층 가공의 용접 성형 특성은 중력의 영향을 크게 받습니다. 성형면의 경사각이 크면 혹 비드(hump bead)와 같은 심각한 결함이 발생합니다.
본 논문에서는 양생면에서 용접 비드 형성의 형성 특성과 제어 방법을 연구하기 위해 용접 용융 풀 유동 역학의 전산 모델을 수립하고 제안된 모델을 검증하기 위해 증착 실험을 수행하였습니다.
결과는 용접 비드 경사각(α)이 증가함에 따라 역류의 속도가 증가하고 상향 용접의 경우 α > 60°일 때 불규칙한 험프 결함이 나타나는 것으로 나타났습니다.
상부 과잉 액체의 하향 압착력과 하부 상향 유동의 반동력과 표면장력 사이의 상호작용은 용접 혹 형성의 주요 요인이었다. 하향 용접의 경우 양호한 형태를 얻을 수 있었으며, 용접 비드 경사각이 증가함에 따라 용접 높이는 감소하고 용접 폭은 증가하였습니다.
하향 및 상향 용접을 위한 곡면의 용융 거동 및 성형 특성을 기반으로 험프 결함을 제어하기 위해 위브 용접을 통한 증착 방법을 제안하였습니다.
성형 궤적의 변화로 인해 용접 방향의 중력 성분이 크게 감소하여 용융 풀 흐름의 안정성이 향상되었으며 복잡한 표면에서 안정적이고 일관된 용접 비드를 얻는 데 유리했습니다.
하향 용접과 상향 용접 사이의 단일 비드의 치수 편차는 7% 이내였으며 하향 및 상향 혼합 혼합 비드 중첩 증착에서 비드의 변동 편차는 0.45로 GMAW 기반 적층 제조 공정에서 허용될 수 있었습니다.
이러한 발견은 GMAW를 기반으로 하는 곡선 적층 적층 제조의 용접 비드 형성 제어에 기여했습니다.
The weld forming characteristics of GMAW-based additive manufacturing on curved surface are dramatically influenced by gravity. Large inclined angle of the forming surface would lead to severe defects such as hump bead. In this paper, a computational model of welding molten pool flow dynamics was established to research the forming characteristic and control method of weld bead forming on cured surface, and deposition experiments were conducted to verify the proposed model. Results indicated that the velocity of backward flows increased with the increase of weld bead tilt angle (α) and irregular hump defects appeared when α > 60° for upward welding. The interaction between the downward squeezing force of the excess liquid at the top and the recoil force of the upward flow at the bottom and the surface tension were primary factors for welding hump formation. For downward welding, a good morphology shape could be obtained, and the weld height decreased and the weld width increased with the increase of weld bead tilt angle. Based on the molten behaviors and forming characteristics on curved surface for downward and upward welding, the method of deposition with weave welding was proposed to control hump defects. Gravity component in the welding direction was significantly reduced due to the change of forming trajectory, which improved the stability of the molten pool flow and was beneficial to obtain stable and consistent weld bead on complex surface. The dimensional deviations of the single bead between downward and upward welding were within 7% and the fluctuation deviation of the bead in multi-bead overlapping deposition with mixing downward and upward welding was 0.45, which could be acceptable in GMAW-based additive manufacturing process. These findings contributed to the weld bead forming control of curve layered additive manufacturing based on GMAW.
Keywords
- Molten pool behaviors
- GMAW-based WAAM
- Deposition with weave welding
- Welding on curved surface
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References
- 1.Williams SW, Martina F, Addison AC, Ding J, Pardal G, Colegrove P (2016) Wire + arc additive manufacturing. Mater Sci Technol (United Kingdom) 32:641–647. https://doi.org/10.1179/1743284715Y.0000000073Article Google Scholar
- 2.Pan ZX, Ding DH, Wu BT, Cuiuri D, Li HJ, Norrish J (2018) Arc welding processes for additive manufacturing: a review. In: Transactions on intelligent welding manufacturing. Springer Singapore, pp 3–24. https://doi.org/10.1007/978-981-10-5355-9_1
- 3.Panchagnula JS, Simhambhatla S (2018) Manufacture of complex thin-walled metallic objects using weld-deposition based additive manufacturing. Robot Comput Integr Manuf 49:194–203. https://doi.org/10.1016/j.rcim.2017.06.003Article Google Scholar
- 4.Lu S, Zhou J, Zhang JS (2015) Optimization of welding thickness on casting-steel surface for production of forging die. Int J Adv Manuf Technol 76:1411–1419. https://doi.org/10.1007/s00170-014-6371-9Article Google Scholar
- 5.Huang B, Singamneni SB (2015) Curved layer adaptive slicing (CLAS) for fused deposition modelling. Rapid Prototyp J 21:354–367. https://doi.org/10.1108/RPJ-06-2013-0059Article Google Scholar
- 6.Jin Y, Du J, He Y, Fu GQ (2017) Modeling and process planning for curved layer fused deposition. Int J Adv Manuf Technol 91:273–285. https://doi.org/10.1007/s00170-016-9743-5Article Google Scholar
- 7.Xie FB, Chen LF, Li ZY, Tang K (2020) Path smoothing and feed rate planning for robotic curved layer additive manufacturing. Robot Comput Integr Manuf 65. https://doi.org/10.1016/j.rcim.2020.101967
- 8.Ding YY, Dwivedi R, Kovacevic R (2017) Process planning for 8-axis robotized laser-based direct metal deposition system: a case on building revolved part. Robot Comput Integr Manuf 44:67–76. https://doi.org/10.1016/j.rcim.2016.08.008Article Google Scholar
- 9.Cho DW, Na SJ (2015) Molten pool behaviors for second pass V-groove GMAW. Int J Heat Mass Transf 88:945–956. https://doi.org/10.1016/j.ijheatmasstransfer.2015.05.021Article Google Scholar
- 10.Cho DW, Na SJ, Cho MH, Lee JS (2013) A study on V-groove GMAW for various welding positions. J Mater Process Technol 213:1640–1652. https://doi.org/10.1016/j.jmatprotec.2013.02.015Article Google Scholar
- 11.Hejripour F, Valentine DT, Aidun DK (2018) Study of mass transport in cold wire deposition for wire arc additive manufacturing. Int J Heat Mass Transf 125:471–484. https://doi.org/10.1016/j.ijheatmasstransfer.2018.04.092Article Google Scholar
- 12.Yuan L, Pan ZX, Ding DH, He FY, Duin SV, Li HJ, Li WH (2020) Investigation of humping phenomenon for the multi-directional robotic wire and arc additive manufacturing. Robot Comput Integr Manuf 63. https://doi.org/10.1016/j.rcim.2019.101916
- 13.Nguyen MC, Medale M, Asserin O, Gounand S, Gilles P (2017) Sensitivity to welding positions and parameters in GTA welding with a 3D multiphysics numerical model. Numer Heat Transf Part A Appl 71:233–249. https://doi.org/10.1080/10407782.2016.1264747Article Google Scholar
- 14.Gu H, Li L (2019) Computational fluid dynamic simulation of gravity and pressure effects in laser metal deposition for potential additive manufacturing in space. Int J Heat Mass Transf 140:51–65. https://doi.org/10.1016/j.ijheatmasstransfer.2019.05.081Article Google Scholar
- 15.Cho MH, Farson DF (2007) Understanding bead hump formation in gas metal arc welding using a numerical simulation. Metall Mater Trans B Process Metall Mater Process Sci 38:305–319. https://doi.org/10.1007/s11663-007-9034-5Article Google Scholar
- 16.Nguyen TC, Weckman DC, Johnson DA, Kerr HW (2005) The humping phenomenon during high speed gas metal arc welding. Sci Technol Weld Join 10:447–459. https://doi.org/10.1179/174329305X44134Article Google Scholar
- 17.Philip Y, Xu ZY, Wang Y, Wang R, Ye X (2019) Investigation of humping defect formation in a lap joint at a high-speed hybrid laser-GMA welding. Results Phys 13. https://doi.org/10.1016/j.rinp.2019.102341
- 18.Hu ZQ, Qin XP, Shao T, Liu HM (2018) Understanding and overcoming of abnormity at start and end of the weld bead in additive manufacturing with GMAW. Int J Adv Manuf Technol 95:2357–2368. https://doi.org/10.1007/s00170-017-1392-9Article Google Scholar
- 19.Tang SY, Wang GL, Huang C, Li RS, Zhou SY, Zhang HO (2020) Investigation, modeling and optimization of abnormal areas of weld beads in wire and arc additive manufacturing. Rapid Prototyp J 26:1183–1195. https://doi.org/10.1108/RPJ-08-2019-0229Article Google Scholar
- 20.Bai X, Colegrove P, Ding J, Zhou XM, Diao CL, Bridgeman P, Honnige JR, Zhang HO, Williams S (2018) Numerical analysis of heat transfer and fluid flow in multilayer deposition of PAW-based wire and arc additive manufacturing. Int J Heat Mass Transf 124:504–516. https://doi.org/10.1016/j.ijheatmasstransfer.2018.03.085Article Google Scholar
- 21.Siewert E, Schein J, Forster G (2013) Determination of enthalpy, temperature, surface tension and geometry of the material transfer in PGMAW for the system argon-iron. J Phys D Appl Phys 46. https://doi.org/10.1088/0022-3727/46/22/224008
- 22.Goldak J, Chakravarti A, Bibby M (1984) A new finite element model for welding heat sources. Metall Trans B 15:299–305. https://doi.org/10.1007/BF02667333Article Google Scholar
- 23.Fachinotti VD, Cardona A (2008) Semi-analytical solution of the thermal field induced by a moving double-ellipsoidal welding heat source in a semi-infinite body. Mec Comput XXVII:1519–1530
- 24.Nguyen NT, Mai YW, Simpson S, Ohta A (2004) Analytical approximate solution for double ellipsoidal heat source in finite thick plate. Weld J 83:82–93Google Scholar
- 25.Goldak J, Chakravarti A, Bibby M (1985) A double ellipsoid finite element model for welding heat sources. IIW Doc. No. 212-603-85
- 26.Gu Y, Li YD, Yong Y, Xu FL, Su LF (2019) Determination of parameters of double-ellipsoidal heat source model based on optimization method. Weld World 63:365–376. https://doi.org/10.1007/s40194-018-00678-wArticle Google Scholar
- 27.Wu CS, Tsao KC (1990) Modelling the three-dimensional fluid flow and heat transfer in a moving weld pool. Eng Comput 7:241–248. https://doi.org/10.1108/eb023811Article Google Scholar
- 28.Zhan XH, Liu XB, Wei YH, Chen JC, Chen J, Liu HB (2017) Microstructure and property characteristics of thick Invar alloy plate joints using weave bead welding. J Mater Process Technol 244:97–105. https://doi.org/10.1016/j.jmatprotec.2017.01.014Article Google Scholar
- 29.Zhan XH, Zhang D, Liu XB, Chen J, Wei YH, Liu RP (2017) Comparison between weave bead welding and multi-layer multi-pass welding for thick plate Invar steel. Int J Adv Manuf Technol 88:2211–2225. https://doi.org/10.1007/s00170-016-8926-4Article Google Scholar
- 30.Xu GX, Li L, Wang JY, Zhu J, Li PF (2018) Study of weld formation in swing arc narrow gap vertical GMA welding by numerical modeling and experiment. Int J Adv Manuf Technol 96:1905–1917. https://doi.org/10.1007/s00170-018-1729-zArticle Google Scholar
- 31.Li YZ, Sun YF, Han QL, Zhang GJ, Horvath I (2018) Enhanced beads overlapping model for wire and arc additive manufacturing of multi-layer multi-bead metallic parts. J Mater Process Technol 252:838–848. https://doi.org/10.1016/j.jmatprotec.2017.10.017Article Google Scholar