Spectroscopic Measurements of Hydrogen and Oxygen in Shielding Gas During Plasma Arc Welding

1993 ◽  
Vol 115 (1) ◽  
pp. 145-148 ◽  
Author(s):  
Q. Pang ◽  
T. Pang ◽  
J. C. McClure ◽  
A. C. Nunes
Keyword(s):  
Flow Rate ◽  
Arc Welding ◽  
Gas Flow ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Shielding Gas ◽  
Gas Flow Rate ◽  
Average Temperature ◽  
Welding Arc

In Situ optical spectroscopy has been used on plasma arc welded 2219 aluminum to measure both the average temperature of and the amount of hydrogen and oxygen in the welding arc. Hydrogen and oxygen levels of less than 75 ppm can be readily detected. It is shown that below a critical shield gas flow rate, the rapid invasion of atmosphere can be readily detected by this technique, and that this critical flow rate is dependent on the temperature of the arc.

The Effect of Weld Gas Flow Rate on Al-Li Weldability

1993 ◽  
Vol 115 (3) ◽  
pp. 263-267
Author(s):  
L. F. Martinez ◽  
J. C. McClure ◽  
A. C. Nunes
Keyword(s):  
Flow Rate ◽  
Arc Welding ◽  
Gas Flow ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Gas Flow Rate ◽  
Welding Arc ◽  
Variable Polarity ◽  
Variable Polarity Plasma Arc

Adequate shield and plasma gas flow rate during plasma arc welding are crucial factors in achieving high quality welds. Too low a shield gas flow rate lets atmosphere enter into the arc and too high a rate wastes weld gas and may cause turbulence and entrain atmosphere. Sufficient plasma gas flow is required for keyhole welding and, as shown in this paper, can reduce hydrogen contamination in the weld. In-situ optical spectroscopy used to detect oxygen and hydrogen in the welding arc during variable polarity plasma arc (VPPA) welding of aluminum 2090 revealed that there is an easily detected critical shield gas flow rate needed to exclude atmosphere and that this critical rate can be used to automatically control gas flow rates during welding.

In situ monitoring and penetration prediction of plasma arc welding based on welder intelligence-enhanced deep random forest fusion

2021 ◽  
Vol 66 ◽  
pp. 153-165
Author(s):  
Di Wu ◽  
Minghua Hu ◽  
Yiming Huang ◽  
Peilei Zhang ◽  
Zhishui Yu
Keyword(s):  
Random Forest ◽  
Arc Welding ◽  
In Situ Monitoring ◽  
Plasma Arc Welding ◽  
Plasma Arc

Experimental analysis of the effect of gas flow rate and nature on plasma arc cutting of hardox-400

2019 ◽  
Vol 64 (2) ◽  
pp. 345-352 ◽  
Author(s):  
Deepak Kumar Naik ◽  
Kalipada Maity
Keyword(s):  
Flow Rate ◽  
Experimental Analysis ◽  
Gas Flow ◽  
Plasma Arc ◽  
Gas Flow Rate ◽  
Plasma Arc Cutting

Effect of N2 shielding gas flow rate on microstructure and weld surface corrosion resistance of high nitrogen steel by laser-arc hybrid welding

2019 ◽  
Vol 6 (8) ◽  
pp. 0865j2
Author(s):  
Liu Sicong ◽  
Cui Bo ◽  
Bai Di ◽  
Yan Shenghong ◽  
Zhang Hong
Keyword(s):  
Corrosion Resistance ◽  
Flow Rate ◽  
Gas Flow ◽  
Hybrid Welding ◽  
Shielding Gas ◽  
Gas Flow Rate ◽  
High Nitrogen Steel ◽  
High Nitrogen ◽  
Surface Corrosion ◽  
Nitrogen Steel

scholarly journals The Effect of Process Parameters on the Microstructure and Mechanical Properties of AW5083 Aluminum Laser Weld Joints

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1443 ◽  
Author(s):  
Maroš Vyskoč ◽  
Miroslav Sahul ◽  
Mária Dománková ◽  
Peter Jurči ◽  
Martin Sahul ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Process Parameters ◽  
Flow Rate ◽  
Weld Joint ◽  
Gas Flow ◽  
Filler Wire ◽  
Shielding Gas ◽  
Gas Flow Rate ◽  
Weld Joints

In this article, the effect of process parameters on the microstructure and mechanical properties of AW5083 aluminum alloy weld joints welded by a disk laser were studied. Butt welds were produced using 5087 (AlMg4.5MnZr) filler wire, with a diameter of 1.2 mm, and were protected from the ambient atmosphere by a mixture of argon and 30 vol.% of helium (Aluline He30). The widest weld joint (4.69 mm) and the highest tensile strength (309 MPa) were observed when a 30 L/min shielding gas flow rate was used. Conversely, the narrowest weld joint (4.15 mm) and the lowest tensile strength (160 MPa) were found when no shielding gas was used. The lowest average microhardness (55.4 HV0.1) was recorded when a 30 L/min shielding gas flow rate was used. The highest average microhardness (63.9 HV0.1) was observed when no shielding gas was used. In addition to the intermetallic compounds, β-Al3Mg2 and γ-Al12Mg17, in the inter-dendritic areas of the fusion zone (FZ), Al49Mg32, which has an irregular shape, was recorded. The application of the filler wire, which contains zirconium, resulted in grain refinement in the fusion zone. The protected weld joint was characterized by a ductile fracture in the base material (BM). A brittle fracture of the unshielded weld joint was caused by the presence of Al2O3 particles. The research results show that we achieved the optimal welding parameters, because no cracks and pores were present in the shielded weld metal (WM).

Effect of shielding gas flow rate on arc behaviors in GMAW with single cable-typed wire

2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040059
Author(s):  
Qingxian Hu ◽  
Lei Zhang ◽  
Juan Pu ◽  
Caichen Zhu
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Gas Metal Arc Welding ◽  
Three Dimensional ◽  
Maximum Velocity ◽  
Maximum Flow ◽  
Maximum Pressure ◽  
Arc Plasma ◽  
Shielding Gas ◽  
Gas Flow Rate

A three-dimensional numerical model of arc in gas metal arc welding (GMAW) with single cable-typed wire was established based on the theory of arc physics. The influences of different shielding gas flow rates on the features of temperature field, velocity field and pressure field were investigated. The results showed that the maximum velocity of arc plasma along radial direction and the arc pressure on the surface of workpieces were increased obviously with the increase of the shielding gas flow rate, while the arc temperature was changed little. This phenomenon was mainly attributed to the increasing collisions between arc plasmas and the self-rotation action of cable-typed wires. The arc temperature at the tip of the cable-typed wire reached the maximum. The maximum flow velocity of arc plasma was located at the tip of wire (2–8 mm). The arc pressures in the central axis reached the maximum pressure. The simulation results were in agreement with the experimental results.

Experimental Analysis of Welding Parameters on Variable Polarity Plasma Arc Pressure

2013 ◽  
Vol 651 ◽  
pp. 355-360 ◽  
Author(s):  
Yi Jiang ◽  
Ming Liu ◽  
Yao Hui Lu ◽  
Bin Shi Xu
Keyword(s):  
Arc Welding ◽  
Gas Flow ◽  
Welding Current ◽  
Welding Parameters ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Arc Pressure ◽  
Variable Polarity ◽  
Reversed Polarity ◽  
Variable Polarity Plasma Arc

Variable polarity plasma arc welding has been widely used to manufacture industries. The effects of welding current and plasma gas flow as the most important parameters on variable polarity plasma arc pressure were discussed experimentally. To welding current, two experimental were designed to discuss the effects of straight polarity current and reversed polarity current on arc pressure respectively. It could be concluded that arc pressure is quadratic with welding current. To plasma gas flow, both experimental and numerical analysis are used to discuss the mechanisms of plasma gas flow to arc pressure, and it could be conclude that arc pressure is quadratic with plasma gas flow rather than linear.

In-situ weld-alloying plasma arc welding of SiCp/Al MMC

2007 ◽  
Vol 17 (2) ◽  
pp. 313-317 ◽  
Author(s):  
Yu-cheng LEI ◽  
Wei-jin YUAN ◽  
Xi-zhang CHEN ◽  
Fei ZHU ◽  
Xiao-nong CHENG
Keyword(s):  
Arc Welding ◽  
Plasma Arc Welding ◽  
Plasma Arc

Workpiece Cleaning During Variable Polarity Plasma Arc Welding of Aluminum

1994 ◽  
Vol 116 (4) ◽  
pp. 463-466 ◽  
Author(s):  
Q. Pang ◽  
T. Pang ◽  
J. C. McClure ◽  
A. C. Nunes
Keyword(s):  
Arc Welding ◽  
Dielectric Breakdown ◽  
Surface Preparation ◽  
Refractory Oxide ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Reverse Polarity ◽  
Variable Polarity ◽  
Variable Polarity Plasma Arc

Variable Polarity Plasma Arc welding has proved to be extremely successful in welding aluminum alloys despite their adherent refractory oxide. This success has been attributed to removal of the oxide during the reverse polarity cycle. In situ optical spectroscopy is used to measure the amount of hydrogen and oxygen in the plasma arc with a minimum detectable limit of less than 100 ppm. It was found that the amount of contamination is independent of surface preparation and torch speed. Using this information, it is proposed that the predominant mechanism for reverse polarity cleaning in aluminum is dielectric breakdown of the surface oxide ahead of the torch rather than by ion sputtering.

scholarly journals Influence of shielding gas flow rate on properties of steel S960QL welded joint

2020 ◽  
Author(s):  
Štěpán JEŽEK ◽  
Jakub HORVÁTH ◽  
Ladislav KOLAŘÍK ◽  
Jiří JANOVEC ◽  
Marie KOLAŔÍKOVÁ
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Welded Joint ◽  
Shielding Gas ◽  
Gas Flow Rate
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