Parameter optimization of multi-pass multi-layer MIG welded joint for invar alloy

Zhan, Xiaohong; Liu, Jingtao; Chen, Jicheng; Peng, Qingyu; Wei, Yanhong; Zhao, Yanqiu

doi:10.1007/s00170-016-8544-1

Cited by 15 publications

(4 citation statements)

References 19 publications

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“…The grain coarsening was due to the fact that the molten pool stayed at high temperature for a long time, which promoted the growth of columnar crystals. Different from other welding methods, no equiaxial crystal region was formed in the K-TIG weld, which was mainly because of low supercooling degree [22, 23]. Epitaxial solidification and half fused grain were clearly observed, as shown in Figure 3(c).…”

Section: Resultsmentioning

confidence: 89%

Microstructure and mechanical properties of Invar36 alloy joints using keyhole TIG welding

Yang

Liu

et al. 2020

Science and Technology of Welding and Joining

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Single-pass keyhole TIG welding (K-TIG) was used to weld 10-mm-thick Invar36 alloy plates without filler metal and groove preparation. The effects of joint gap, welding current, welding speed and arc length on the weld appearance, microstructure and mechanical properties were investigated. No phase transformation occurred in the weld where only austenite (γ -(Fe, Ni)) was formed, while the grain structure changed significantly. The maximum tensile strength of K-TIG weld was 440.7 MPa reaching 99.9% of the base metal and the maximum elongation was 31.5%. The microhardness in the weld zone was slightly lower than that of the base metal. The results suggested that K-TIG welding was a very promising method for the joining of middle-thick Invar36 alloy plates.

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Section: Resultsmentioning

confidence: 89%

Microstructure and mechanical properties of Invar36 alloy joints using keyhole TIG welding

Yang

Liu

et al. 2020

Science and Technology of Welding and Joining

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“…To mitigate these constraints, innovative hybrid welding techniques, merging laser welding with supplementary welding methods, have been introduced. Notably, the laser-MIG hybrid welding technique has emerged as a significant advancement, offering enhanced penetration depth, increased weld width, and improved modulation of weld microstructure [18]. In addition, the use of arc bridging ability can achieve a synergistic effect of "1 + 1 > 2".…”

Section: Introductionmentioning

confidence: 99%

“…Laser-arc hybrid welding only needs a few layers of thick plate, which significantly improves the efficiency compared with traditional MIG welding. By combining the advantages of both laser and MIG welding processes, laser-MIG hybrid welding offers a potential solution to overcome the challenges associated with traditional laser welding techniques and produce high-quality welded joints in titanium alloys [7,18].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Impact Toughness of Laser-Arc Hybrid Welded Joint of Medium-Thick TC4 Titanium Alloy

Luo,

Feng,

et al. 2024

Coatings

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This study delves into the impact toughness of medium-thick (12 mm thick) titanium alloy joints crafted through a multi-layer, multi-pass welding technique that blends laser-arc (MIG) hybrid welding technology. Microstructural scrutiny, employing optical microscopy, SEM and TEM, unveils a consistent composition across weld passes, with prevailing α/α′ phases interspersed with some β phase, resulting in basket-weave structures primarily dominated by acicular α′ martensite. However, upper regions exhibit Widmanstatten microstructures, potentially undermining joint toughness. Hardness testing indicates higher values in cosmetic layers (~420 HV) compared to backing layers and bending tests manifest superior toughness in lower joint regions, attributed to smaller grain sizes induced by repetitive welding thermal cycles. Impact toughness assessment unveils diminished values in the weld metal (WM) compared to the heat-affected zone (HAZ) and base material (BM), amounting to 91.3% of the base metal’s absorption energy. This decrement is ascribed to heightened porosity in upper regions and variations in grain size and phase composition due to multi-layer, multi-pass welding. Microstructural analysis proximal to failure sites suggests one mechanism wherein crack propagation is impeded by the β phase at acute crack angles. In essence, this study not only underscores the practicality of laser-MIG hybrid welding for medium-thick TC4 alloy plates but also underscores the reliability of joint mechanical properties.

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“…Presently, there are a variety of welding methods applied to the connection of Invar alloy, including shielded metal arc welding (SMAW), submerged arc welding (SAW), tungsten inert gas (TIG) arc welding, metal inert gas (MIG) arc welding, friction stir welding (FSW) and laser welding (LW). [5][6][7] Besides, some improved welding methods have been developed, for example, laser-TIG hybrid welding, 8 pulsed MIG and so on.…”

Section: Introductionmentioning

confidence: 99%

A comparative study between pulsed metal inert gas welding and continuous metal inert gas welding on thin Invar alloy

Zhan

Meng

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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The pulsed metal inert gas welding and continuous metal inert gas welding with various parameters are implemented on 2-mm-thick Invar36 alloy plates. The pulsed metal inert gas welding and continuous metal inert gas welding with the same filler metal and base metal are compared by considering the morphology, microstructure of weld seam and mechanical properties. It is indicated that the size of weld seam obtained in pulsed welding is significantly different from that in continuous welding. Meanwhile, it reveals that there is a triangle zone at the bottom of weld seam in both types of welding technology for Invar36 alloy. The microstructure in triangle zone of pulsed welding and continuous welding is focused. In addition, the essential difference between pulsed metal inert gas welding and continuous metal inert gas welding is discussed in detail by analyzing the formation mode of the droplet metal at the end of wire.

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Parameter optimization of multi-pass multi-layer MIG welded joint for invar alloy

Cited by 15 publications

References 19 publications

Microstructure and mechanical properties of Invar36 alloy joints using keyhole TIG welding

Microstructure and mechanical properties of Invar36 alloy joints using keyhole TIG welding

Microstructure and Impact Toughness of Laser-Arc Hybrid Welded Joint of Medium-Thick TC4 Titanium Alloy

A comparative study between pulsed metal inert gas welding and continuous metal inert gas welding on thin Invar alloy

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