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2026年第56卷第9期
“Huaguang”Cup Excellent Thesis Recommendation
摘要：To broaden the process window and improve arc stability of KTIG welding, laser‑KTIG hybrid welding was employed to carry out butt‑welding experiments on Q235 carbon steel and 304L stainless steel. The influences of laser irradiation position, welding speed and laser power on process stability and weld formation of hybrid welding were investigated. An in‑situ X‑ray transmission imaging system was utilized to acquire real‑time images of keyhole initiation and evolution during hybrid welding and single KTIG welding. The results reveal that the arc‑penetration mode is generated when the laser irradiates the front wall of the keyhole, while the laser‑penetration mode forms as the laser irradiates the rear wall of the keyhole. Under the arc‑penetration mode, welding stability and arc morphology are predominantly governed by welding speed and laser power. For keyhole generation and evolution, laser irradiation modifies the arc ignition position and arc stiffness, resulting in keyhole deflection whose magnitude depends on welding speed and laser power. Appropriate parameter configuration can achieve a vertical keyhole geometry, which mitigates the susceptibility to process‑related porosity.关键词：KTIG;keyhole;arc morphology;in-situ X-ray diffraction;hybrid welding111|25|0更新时间：2026-09-10- 摘要：To address the extensive groove preparation and high filler metal consumption associated with conventional multi-pass welding of medium-thick low-carbon steel plates, as well as the poor stability of the back- weld appearance during one-pass full-penetration welding, a pulsed laser-cold metal transfer (CMT) arc hybrid welding process was proposed. 10 mm-thick Q235B steel plates were used to investigate the effects of the heat- source leading mode, laser-arc distance, and laser pulse parameters on arc stability, weld penetration, and weld appearance. A Box-Behnken design was further employed to optimize the pulse frequency and duty cycle of the laser beam. The results showed that the laser-leading mode reduced fluctuations in arc voltage and droplet-transfer period. If the continuous laser was used, the weld penetration state changed abruptly between incomplete penetration and back humping weld. While the pulsed laser can provide additional control of the instantaneous penetration capability to inhibit the formation of back humping weld, the duty cycle had a more significant effect on back-weld appearance than the pulse frequency. At the optimized parameter combination of a pulse frequency of 112 Hz and a duty cycle of 91%, sound one-pass welding with back-formation was achieved without groove or back-forming assistance. The tensile specimens fractured in the base metal, and the tensile strength and elongation were 478.4 MPa and 22.9%, respectively. The room-temperature impact energies at the weld center and fusion zone were 55.9 J and 91.6 J, respectively, and the joint exhibited good overall mechanical properties. The developed welding process was used to manufacture hydraulic cylinder barrels with a 10 mm wall thickness; the welding efficiency increased by approximately 80%, filler wire consumption decreased by approximately 84%, and the roundness and concentricity deviations were less than 0.1 mm. The developed welding process offers a new technical approach to highly efficient, low-energy welding of medium-thick steel structures.关键词：laser + CMT arc hybrid welding;medium-thick plate;one-pass welding with back-formation;pulsed laser welding;high-efficiency welding151|22|0更新时间：2026-09-10
- 摘要：This study systematically investigates the effect of tool lateral offset on weld formation and joint performance during friction stir welding (FSW) of 6 mm thick 6005A-T6 aluminum alloy train floor extrusions, and determines the offset tolerance. Through lateral offset tests (within 1/3 of the pin radius, i.e., 3 mm), a comparative analysis was conducted on the macro/microstructure, hardness, tensile properties, residual stress, and fatigue performance of joints when the tool was offset toward the lap side and the support side. The results show that the offset direction significantly affects the distribution of forging force and joint deformation; offset toward the support side helps reduce the lap gap. The microhardness distribution of the joint exhibits a “W” shape, with the heat-affected zone (HAZ) being the mechanically weak region. When the offset is within the tolerance, the joint tensile strength reaches 211-222 MPa (exceeding 80% of the base metal strength), and fracture occurs in the HAZ on the lap side, with the fracture surface showing typical ductile fracture characteristics. The transverse residual stress distribution is high in the middle and low at both ends, with a maximum value of approximately 169-171 MPa. The fatigue limit is 112 MPa (at 50% survival rate). It is concluded that when the lateral offset is controlled within 1/3 of the pin radius, effective penetration depth can be ensured, deformation controlled, and tunnel or void defects avoided. In practical welding, it is recommended to preferentially position the tool toward the support side of the profile web.关键词：Aluminum alloy 6005A-T6;friction stir welding (FSW);lateral offset;mechanical properties;fatigue65|18|0更新时间：2026-09-10
- 摘要：The aviation industry’s rapid development highlights aircraft metal corrosion, especially for parts like nacelle lips exposed to varying environments, greatly impacting flight safety. In this paper, we propose a “sandwich” superhydrophobic anticorrosive coating containing ZIF-7, which utilizes nanocontainer technology to achieve rapid environmental response. ZIF-7-encapsulated corrosion inhibitor releases during corrosion, preventing leakage and coating damage. In addition, a superhydrophobic coating has been added on top of the anticorrosive coating, which has been imparted with a surface water contact angle of up to 154°±3° and a water sliding angle of about 3°. It also has excellent physical/chemical stability, and it remains superhydrophobic even after repeated mechanical abrasion and acid/alkali immersion. The double-layer structure not only further enhances the “labyrinth effect” and extends the path for corrosive media to reach the metal surface, but also successfully isolates water and oxygen from the surface of the coating, which significantly improves the coating’s functionality and anticorrosion performance. The highest impedance modulus of 1.3931×1011 Ω·cm2 is seven orders of magnitude higher than that of the bare Al alloy sheet. After 30 days of salt spray testing, the bare Al alloy sheet and conventional coatings corroded significantly, while the ZB/ZnO coating showed no significant change and healing occurred at the scratches. This study introduces ZIF-7 into superhydrophobic corrosion protection and provides insight into practical corrosion protection of aircraft nacelle lips.关键词：superhydrophobic;metal corrosion protection;composite coatings;self-healing46|16|0更新时间：2026-09-10
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