Research on the sidewall penetration mechanisms of cable-type welding wire narrow gap GMAW process

Zhang

Materials Science and Technology

2023

The Mo–Fe–Ti–Ni–Cu medium-entropy alloy (MEA) coating was prepared based on a GMAW – Robotic Integrated Cladding System with the MoFe3TiNiCu cable-type welding wire (CWW) containing 1-Mo, 3-Fe, 1-Ti, 1-Ni and 1-Cu pure metallic wires. The produced MEA coating is composed of FCC major phase and BCC minor phase. The hardness of the produced MEA coating is between 400 HV and 450 HV, while the substrate is about 190 HV. The produced MEA coating can greatly improve the wear resistance of the substrate, and its friction coefficient is 0.4, which is far lower than that of the substrate (0.65).

Section: Resultsmentioning

confidence: 99%

Preparation of medium-entropy alloy coating using GMAW cladding with MoFe₃TiNiCu cable-type welding wire

Zhang

Materials Science and Technology

2023

“…Xu et al [12][13][14] used a self-made angular swing arc NG torch to study the influence of welding gun trajectory and welding parameters, such as wire feeding speed, swing speed and swing angle, on droplet transition in the welding process of a Q235 steel thick plate; the results showed that the regular change in droplet transition was caused by the swing of the welding torch, which changed the distance from the wire tip to the groove sidewall. Fang et al [15] adopted a self-rotating arc that was established by using cable-type welding wire for narrow-gap GMAW, and Yang et al [16] further studied the sidewall penetration mechanisms of the cable-type welding wire narrow-gap GMAW process. Twin-wire narrow-gap welding was first proposed by the Battelle Research Institute.…”

Section: Introductionmentioning

confidence: 99%

Effects of Oscillation Width on Arc Characteristics and Droplet Transfer in Vertical Oscillation Arc Narrow-Gap P-GMAW of X80 Steel

Liu

Xue

Zhou

et al. 2023

Metals

In fields, such as oil and gas pipelines and nuclear power, narrow-gap welding has often been used for the connection of thick and medium-thick plates. During the welding process, a lack of fusion was prone to occur due to groove size limitations, seriously affecting the service safety of large structures. The vertical oscillation arc pulsed gas metal arc welding (P-GMAW) method was adopted for narrow-gap welding in this study. The influence of the oscillation width on arc morphology, droplet transfer behavior and weld formation during narrow-gap welding was studied. Oscillation widths from 0 to 4 mm were used to weld narrow-gap grooves with a bottom width of 6 mm. The results show that, in non-oscillation arc welding, the arc always presented a bell cover shape, and the droplet transfer was in the form of one droplet per pulse, while the sidewall penetration of the weld was relatively small, making it prone to a lack of fusion. With an increase in the oscillation width, the arc gradually shifted to the sidewall. The droplet transfer mode was a mixed transfer of large and small droplets, and the sidewall penetration continued to increase, which was conducive to the fusion of the sidewall. However, when the oscillation width was wider than 3 mm, it led to the phenomenon of the arc climbing to the sidewall, and the weld was prone to porosity, undercutting and other welding defects. The oscillation width has a major impact on the stability of the welding process in vertical oscillation arc narrow-gap welding.

“…In view of its many technical advantages, researchers have conducted a lot of research on this type of wire. Yang [ 26 ] et al compared the microstructural characteristics and mechanical properties of stranded and single solid wire welds under the same welding parameters. The results showed that cable wires were highly efficient and exhibited satisfactory sidewall depth of fusion during the welding process.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on Laser Welding Thick-Walled TC4 Titanium Alloy with Flux-Cored Wire and Cable Wire

et al. 2023

Self Cite

In the welding process of thick-walled titanium alloys, the selection of the wire type is one of the critical factors affecting the welding quality. In this paper, flux-cored and cable wires were used as filler materials in the welding of thick-walled titanium alloys. The macrostructure, microstructure, texture, and grain size of both welded joints were compared by employing an optical microscope (OM), scanning electron microscope (SEM), and transmission electron microscope (TEM), and the tensile and impact properties were also evaluated. The comparison result showed that the fusion zone microstructure of both welded joints was dominated by a basketweave structure composed of interwoven acicular α′ martensite, whereas the microstructure of flux-cored wire welded joints was finer, and the degree of anisotropy was low. The strength of both welded joints was higher than that of the base metal, ensuring that fracture occurred in the base metal area during tension. The Charpy impact energy of the flux-cored wire welded joint was 16.7% higher than that of the cable wire welded joint, indicating that the welded joint obtained with the flux-cored wire performed better in the welding process of thick-walled titanium alloys.