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

Zhan, Xiaoli; Meng, Yi; Gu, Dongdong; Wang, Huimin

doi:10.1177/0954405417748186

Cited by 6 publications

(4 citation statements)

References 23 publications

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“…It was followed by single-pass arc welding, performed by using consumable steel filler wire ER70S-6 (Ø1.0 mm) with short-circuiting (CMT method, heat input value was close to 200 J/mm [25]). After this, the groove in the layer of Q235 steel (thickness δ = 10 mm) was filled in six passes by pulse metal active-gas arc welding with consumable steel wire ER70S-6 (Ø1.0 mm), close in composition to Q235 steel (P-MAG-pulse metal active gas, heat input of each pass was approximately 300 J/mm [26]). Groove parameters for the edges to be welded were as follows: a = 8 mm and b = 10 mm (Figure 2a).…”

Section: Methodsmentioning

confidence: 99%

Features of Intermetallic Formation in the Solid Phase on a Steel–Titanium Bimetal Interface under the Conditions of Arc Welding

Korzhyk

Zhang

Khaskin

et al. 2023

Metals

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The object of this study is the formation of intermetallic phases (IMPhs) in the heat-affected zone (HAZ) of joints of steel–titanium bimetal plates produced by arc welding. A titanium layer (2 mm) was welded by the plasma method (PAW), a barrier layer of Cusi3Mn1 bronze was deposited on it by the TIG method, the first steel layer was deposited by CMT, and Puls-MAG was used for filling the groove. Here, heating in the solid phase takes place in the HAZ, which may lead to undesirable formation of brittle IMPhs and further welded joint failure. Mathematical modeling was performed and metallurgical features formed during the processes of heating of the HAZ in bimetal steel–titanium plates were studied to identify the risk of IMPh formation. It was found that at a temperature increase from 900 to 1450 °C, a continuous intermetallic layer formed on the steel–titanium interface, which contained FeTi IMPh, and the width of which increased from 1 to 10 μm. In the temperature range 1300…1430 °C, an intermetallic TiFe2-type phase additionally formed from the titanium side. In the temperature range 1430…1450 °C, the TiFe2 phase was replaced by the TiXFe phase, which formed both from the steel side and from the titanium side. This phase consists of intermetallics (73–75% Ti + 27–25% Fe) and (80–85% Ti + 20–15% Fe), and it is close to the Ti2Fe-type phase. The interlayer of intermetallics, formed at temperatures of 900…1300 °C, has a continuous morphology (HV0.01–650…690). At temperatures rising above 1300 °C, the IMPh interlayer became more ramified (HV0.01–590…610) because of the formation of a larger number of pores and microcracks within it. In the temperature range 900…1450 °C, solid-phase diffusion proceeded in the steel–titanium bimetal near the interface of the two metals. A zone of iron diffusion, 5–10 μm to 40–60 μm in width, formed in titanium. In steel, a zone of titanium diffusion 15–20 μm to 120–150 μm in width formed, starting from 1300 °C and higher. It is recommended to perform industrial welding of steel–titanium bimetal in modes, for which the heat input is equal to 200…400 J/mm. Here, during the period 10–12 s, the heating temperature of the HAZ 1.5–3.5 mm in width is equal to 900–1150 °C. It promotes formation of an intermetallic FeTi-type interlayer of up to 1–2 μm width.

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Section: Methodsmentioning

confidence: 99%

Features of Intermetallic Formation in the Solid Phase on a Steel–Titanium Bimetal Interface under the Conditions of Arc Welding

Korzhyk

Zhang

Khaskin

et al. 2023

Metals

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“…In the eld of multilayer copper foils welding, Resistance Spot Welding(RSW),Melt Inert Gas Welding(MIG),Laser Beam Welding(LBW) and Ultrasonic Welding (USW), the multilayer copper foils material welded together to facilitate the connection of related devices. When the above process methods are used to weld multilayer copper foils materials, there are mainly high temperatures or vibrations that affect the safety performance of the batteries and the high cost of use, which has become the major problem in the soft connection of new energy vehicles [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Achievement of defect-free and high-properties Multilayer copper foils soft connection by Friction Stir Welding

Li,

Deng,

Zeng

et al. 2023

Preprint

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The connection of new energy vehicle batteries often involves a copper soft connection. In this experiment, Friction Stir Welding (FSW) of multilayer copper foils (TU1) were proposed for the research of copper soft connection. It studies the correlation between microhardness profiles, conductivity test data, welding morphology and process parameters. When the rotation speed increased from 300,600,900,1200 rpm to 1500 rpm, the copper color of the weld changes, and the welding morphology is better at the parameter of 900 rpm-80 mm/min. Elongated grains were processed into fine equiaxed and recrystallized grains by FSW. Continuous dynamic recrystallization (CDRX) was the main restoration mechanism responsible for the microstructural evolution in the NZ. After 900 rpm-80 mm/min FSW of multilayer copper foils, the hardness of the welding zone increases 23 HV and the conductivity decreases 22 IACS. After friction stir welding, the hardness value is the opposite trend of ω/v changes, and conductivity value is the similar change trend of ω/v changes in the NZ.

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“…Different variants of ferrites such as acicular ferrite (AF), bainite (B), grain boundary ferrite (GBF), polygonal ferrite (PF), and widmanstatten ferrite (WF), or a combination thereof were observed depending on the method of welding. 11–16 However, AF variant has an advantageous; it improves toughness and strength in parallel. The inclusions are considered as nucleation site for acicular ferrite.…”

Section: Introductionmentioning

confidence: 99%

Effect of inclusions on microstructure and mechanical behavior of multi-pass welded naval grade steel

Kannan

Arivazhagan

Rao

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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This paper assesses the metallurgical characteristics and mechanical properties of multi-pass gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW) of micro-alloyed steel DMR 249-A. The prime objective was to carry out a comparative study of the microstructure and mechanical properties of the joints produced by the two types of welding. A high volume of larger sized inclusions in GMAW contributed to inferior mechanical properties. The coarse-grained part of the heat-affected zone (CGHAZ) showed a lower microhardness. Fracture always occurred in the heat-affected zone, and it is believed that it is associated with CGHAZ. GTAW joints showed low tensile residual stress, higher hardness, and tensile strength. GTA weldment also showed superior impact toughness at sub-zero temperature (–60 °C). Mn-containing inclusions were seen in GTA weldments; it is believed that they promote the formation of acicular ferrite. This is believed to be responsible for the superior mechanical properties of GTA weldments. The microstructural analysis of the two weldments revealed the presence of a higher volume fraction of acicular ferrite in the GTAW. All in all, GTAW joint was found to perform better than GMAW joint.

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

Cited by 6 publications

References 23 publications

Features of Intermetallic Formation in the Solid Phase on a Steel–Titanium Bimetal Interface under the Conditions of Arc Welding

Features of Intermetallic Formation in the Solid Phase on a Steel–Titanium Bimetal Interface under the Conditions of Arc Welding

Achievement of defect-free and high-properties Multilayer copper foils soft connection by Friction Stir Welding

Effect of inclusions on microstructure and mechanical behavior of multi-pass welded naval grade steel

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