Droplet transfer behavior of narrow gap laser wire filling welding

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940045 ◽  
Author(s):  
Z. Zhang ◽  
R. Wang ◽  
G. Gou ◽  
H. Chen ◽  
W. Gao
Keyword(s):  
Welding Speed ◽  
High Speed ◽  
Transition Period ◽  
High Speed Photography ◽  
Narrow Gap ◽  
Droplet Transfer ◽  
Transfer Behavior ◽  
Feeding Speed ◽  
Wire Feeding ◽  
Droplet Transition

In this paper, we study the droplet transition behavior of narrow gap laser wire filling welding under the condition of changing welding speed and wire feeding speed, and it was observed by high-speed photography. It was found that with the increase of welding speed, the frequency of droplet transfer was reduced and the transition period was prolonged. With the increase of wire feeding speed, the wire was not fully melted and finally inserted into the molten pool.

Effects of Wire Rotating Frequency on Metal Transfer Process in Rotating Arc Narrow Gap Horizontal GMAW

2011 ◽  
Vol 189-193 ◽  
pp. 3395-3399 ◽  
Author(s):  
Ning Guo ◽  
Yan Fei Han ◽  
Chuan Bao Jia ◽  
Yong Peng Du
Keyword(s):  
Transfer Process ◽  
High Speed ◽  
Stable Process ◽  
Welding Process ◽  
Metal Transfer ◽  
Welding Parameters ◽  
High Speed Photography ◽  
Narrow Gap ◽  
Weld Formation ◽  
Rotating Arc

The metal transfer process with different welding parameters in rotating arc narrow gap horizontal welding is successfully observed by the high-speed photography system. The effects of wire rotating frequency on metal transfer process in rotating arc narrow gap horizontal welding are novelly explored. The metal transfer with different wire rotating frequency presents different modes. The results indicate that the droplet transfer has stable process with the rotating frequency of 5-20 Hz. And the weld formation is quite shapely. But with the high rotating frequency of 50 Hz, the metal transfer process is not acceptable and the weld formation is very pool. Metal transfer process is one of the most important factors of effecting the weld formation in rotating arc horizontal welding process besides the molten pool behavior and welding thermal circles.

Experimental Characterization of Two-Phase Swirl Flow Interacting With a Circular Bluff Body

2021 ◽  
Author(s):  
Rafael Gonzalez Hernandez ◽  
Afshin Goharzadeh ◽  
Mahmoud Meribout ◽  
Lyes Khezzar
Keyword(s):  
High Speed ◽  
Bluff Body ◽  
Transition Period ◽  
Swirl Flow ◽  
Critical Distance ◽  
High Speed Photography ◽  
Flow Loop ◽  
Two Phase ◽  
Air Pocket ◽  
Air Core

Abstract This study presents an experimental investigation of two-phase swirl flow interacting with a circular bluff body. A horizontal and transparent multiphase flow loop is employed to investigate the dynamic of swirl flow close to the circular bluff body. Using high-speed photography, air-core development during the transition period is characterized. Analysis of both instantaneous and averaged images provides key information on air-core length and diameter for steady state conditions. The distance from air-core tip to the disk depends on a critical gas-liquid ratio (GLRc). The presence of air pocket behind the circular bluff body depends on a critical distance to the disk.

Droplet Transfer on Three Phase Relations at Four-Wire Welding Robot

2012 ◽  
Vol 588-589 ◽  
pp. 1751-1754
Author(s):  
Sheng Mian Xie ◽  
Bi Liang Zhong ◽  
Kai Yuan Wu ◽  
Yuan Mei Wen
Keyword(s):  
Phase Relation ◽  
High Speed ◽  
Phase Relations ◽  
Welding Parameters ◽  
High Speed Photography ◽  
Welding Robot ◽  
Droplet Transfer ◽  
Shielded Metal Arc Welding ◽  
Welding Seam ◽  
Metal Arc Welding

Based on the high-speed photography, the effect of phase relations on droplet transfer and welding seam was analyzed. To each TCGMAW (Twin-wire Co-pool Gas-shielded Metal Arc Welding) torch at four-wire welding robot, under the descriptive welding parameters, when the phase relation of the front wire and the back wire was alternate, the arcs of the two wires had no effect on each other basically; the welding seam shaped very well. When the phase relation was synchronized, the arcs attracted each other and the two arcs centralized to the middle of the two wires; the humping bead was formed. When the phase relation was random, now and then the arcs synchronized and attracted each other, and at times the arcs changed alternately and had no effect on each other; the appearance quality of the welding seam was moderate.

scholarly journals Effect of Alternating Magnetic Field on Arc Plasma Characteristics and Droplet Transfer during Narrow Gap Laser-MIG Hybrid Welding

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1712
Author(s):  
Baihao Cai ◽  
Juan Fu ◽  
Yong Zhao ◽  
Fugang Chen ◽  
Yonghui Qin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Temperature ◽  
High Speed ◽  
Stable State ◽  
Alternating Magnetic Field ◽  
Hybrid Welding ◽  
Arc Plasma ◽  
Narrow Gap ◽  
Droplet Transfer ◽  
The Magnetic Field

In this paper, the morphological characteristics of arc plasma and droplet transfer during the alternating magnetic field-assisted narrow gap groove laser-MIG (metal inert gas) hybrid welding process were investigated. The characteristics of arc plasma and droplet transfer, electron temperature, and density were analyzed using a high-speed camera and spectrum diagnosis. Our results revealed that the arc maintained a relatively stable state and rotated at a high speed to enhance the arc stiffness, and further improved the stability of the arc under the alternating magnetic field. The optimum magnetic field parameters in this experiment were B = 16 mT and f = 20 Hz, the electron temperature was 9893.6 K and the electron density was 0.99 × 1017 cm−3 near the bottom of the groove, which improved the temperature distribution inside the narrow gap groove and eliminated the lack of sidewall fusion defect. Compared to those without a magnetic field, the magnetic field could promote droplet transfer, the droplet diameter decreased by 17.6%, and the transition frequency increased by 23.5% (owing to the centrifugal force during droplet spinning and electromagnetic contraction force). The width of the weld bead was increased by 12.4% and the pores were also significantly reduced due to the stirring of the magnetic field on the molten pool.

A study of droplet transfer behavior in ultra-narrow gap laser arc hybrid welding

2016 ◽  
Vol 87 (9-12) ◽  
pp. 2997-3008 ◽  
Author(s):  
Ruoyang Li ◽  
Jun Yue ◽  
Ran Sun ◽  
Gaoyang Mi ◽  
Chunming Wang ◽  
...  
Keyword(s):  
Hybrid Welding ◽  
Narrow Gap ◽  
Droplet Transfer ◽  
Transfer Behavior

Study on Precision Slicing Process of Single-Crystal Silicon by Using Dicing Wire Saw

2016 ◽  
Vol 1136 ◽  
pp. 350-356 ◽  
Author(s):  
Takaaki Suzuki ◽  
Toshinori Otsuki ◽  
Ji Wang Yan
Keyword(s):  
Single Crystal ◽  
High Precision ◽  
High Speed ◽  
Single Crystal Silicon ◽  
Crystal Silicon ◽  
Wire Saw ◽  
Hard And Brittle Materials ◽  
Feeding Speed ◽  
Wire Feeding ◽  
Control Technologies

Precision slicing tests were performed for single-crystal silicon by using a newly developed dicing wire saw system and diamond wires. The developed dicing wire saw enables slicing thick workpiece of hard and brittle materials which could not be sliced by conventional dicing machines. To achieve high precision and efficiency, the dicing wire saw system adopted tension control and high speed control technologies which provides a maximum wire feeding speed of 2000m/min. In this study, the diamond wire was driven in a single direction at a speed of 750-1750m/min and the slicing force, wire wear and workpiece surface roughness after slicing were investigated experimentally. The results showed that as a new slicing system, the developed dicing wire saw was useable for high-precision slicing of thick workpiece.

scholarly journals The Effect of Wire Feeding Speed on Solidification Cracking of CMT Welding for Al-Si Alloys

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 267
Author(s):  
Lei Huang ◽  
Xizhang Chen ◽  
Sergey Konovalov ◽  
Arshad Noor Siddiquee ◽  
Gang Lu ◽  
...  
Keyword(s):  
Crack Propagation ◽  
High Speed ◽  
Cold Metal Transfer ◽  
Mechanics Model ◽  
Cmt Welding ◽  
Feeding Speed ◽  
Wire Feeding ◽  
Solidification Cracks ◽  
The Stability ◽  
Solidification Crack

In this work, a welding solidification crack sensitivity test platform was established to study the effect of wire feeding speed (WFS) on solidification crack sensitivity during cold metal transfer (CMT) welding for AA6061 aluminum alloy. The test results show that as the WFS increased from 4 m/min to 5.5 m/min, the sensitivity of the solidification cracks also increased. With a further increase in the value of the WFS, the crack sensitivity decreased and eventually ceased to exist. A new perspective of the microstructure and crack propagation mechanics model was applied to understand the effect of WFS on solidification cracks. With the use of scanning electron microscopy (SEM) and a high-speed camera, it was found that as the WFS increased from 4 m/min to 5.5 m/min, the microstructure of the grain size changed from bigger to smaller, and the stability of the crystal microstructure was reduced. The crack propagation mechanics model was changed, which promotes crack propagation, increasing by 233%. When the WFS continued to increase beyond 5.5 m/min, the size of the crystal structure changed from small to big, the stability of the crystal microstructure was increased, the crack generation was suppressed, and the cracking rate was significantly reduced.

scholarly journals DEVELOPMENT AND EVALUATION OF FINGER WHEEL AND CUTTING DISC COMBINED DEVICE FOR STALK RETURNING

2021 ◽  
pp. 54-64
Author(s):  
Zhilong Zhang ◽  
Yongtao Yu ◽  
Qiyong Yang ◽  
Aijun Geng ◽  
Ji Zhang
Keyword(s):  
Rotational Speed ◽  
High Speed ◽  
Great Influence ◽  
Orthogonal Test ◽  
National Standard ◽  
High Speed Photography ◽  
Test Results ◽  
Cutting Power ◽  
Feeding Speed ◽  
Verification Test

Stalk returning technology was an important way to preserve soil nutrients and reduce soil erosion. It was of great significance to improve the stalk chopping quality, reduce power consumption. On the basis of the previous research, the finger wheel and cutting disc combined device for stalk returning was developed, mainly composed of the sawtooth blade group, the finger wheel and the stalk lifting grid. The stalk was fed into the cutting area of the sawtooth blades by the rotation of the finger wheel, and the operation of the stalk chopping was completed under the combination of the sawtooth blade group and the finger wheel. The movement of stalks in the device with finger wheel and sawtooth blades was analysed by high speed photography, and the rotational speed of finger wheel, the rotational speed of sawtooth blade group, the stalk feeding speed had a great influence on the movement of the stalks. Through orthogonal test and verification test, the clamping angle was 20°, the rotational speed of sawtooth blade group was 800 min-1, the stalk feeding speed was 1.45 m/s, the rotational speed of finger wheel was 110 min-1, the cut length qualified rate was 92.47% and the cutting power was 529.97 W. The test results met the quality requirements of the Chinese national standard. The related research can provide reference for the research of stalk returning device.

scholarly journals Laser-CMT Hybrid Welding-Brazing of Al/Steel Butt Joint: Weld Formation, Intermetallic Compounds, and Mechanical Properties

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3651 ◽  
Author(s):  
Yuxin Chen ◽  
Zhibin Yang ◽  
Chunyuan Shi ◽  
Zhibin Xin ◽  
Zitong Zeng
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Intermetallic Compounds ◽  
Welding Speed ◽  
Laser Power ◽  
Hybrid Welding ◽  
Imcs Layer ◽  
Feeding Speed ◽  
Wire Feeding ◽  
Interface Layers

6A01-T5 aluminum alloy and SUS301L-DLT austenitic stainless steel sheets were welded by a laser-cold metal transfer (CMT) hybrid welding-brazing method with ER5183 filler wire. We researched the weld forming, intermetallic compounds, and mechanical character, which are influenced by laser power, wire feeding speed, and welding speed. Well-formed joints with uniformly distributed interface layers were obtained under certain parameters. The spreading and wetting distance on the steel upper surface increased initially and then decreased as the laser power increased, and increased progressively as the wire feeding speed increased or welding speed decreased. There were both Fe2Al5 and Fe4Al13 in the interfacial intermetallic compounds (IMCs) layer. The thickness was controlled to within 2.0–6.9 µm. The thickness of the IMCs layer increased as the heat input increased; however, the increasing rate decreased gradually. The tensile strength of the joints was not only completely dependent on the thickness of the IMCs, but also on the spreading and wetting distance on the steel surface. The highest tensile strength could reach up to 188.7 MPa, which is about 77.1% of that of the base aluminum alloy. The tensile sample fracture occurred at the IMCs layer, and regional metallurgical bonding happened in the interface layer.

Sign in / Sign up

Export Citation Format

Share Document