Workspace and Control System Study for Arc Welding Robot

2013 ◽  
Vol 457-458 ◽  
pp. 612-617
Author(s):  
Dong Zhang ◽  
Zeng Min Lun ◽  
Cehng Yuan Lv ◽  
Shu Xia Zhao ◽  
Wei Yi Pan ◽  
...  
Keyword(s):  
High Pressure ◽  
Arc Welding ◽  
Oil And Gas ◽  
Pressure Vessels ◽  
Working Environment ◽  
Welding Robot ◽  
System Study ◽  
Kinematics Model ◽  
Oil And Gas Pipelines ◽  
And Control

Focusing on welding problems such as poor working environment, high pressure, appalling conditions in oil and gas pipelines, pressure vessels and other large welding, a 6R welding robot was proposed. Based on D-H notation, space kinematics model of robot was founded and the kinematical equations of the grinding robot wad derived. According to the kinematics model, The robot work space was obtained by Monte Carlo methods. Furthermore, control and software system was introduced for the arc welding robotic system.

scholarly journals Experimental study of growth kinetics of CO2 hydrates and multiphase flow properties of slurries in high pressure flow systems

RSC Advances ◽  
2019 ◽  
Vol 9 (56) ◽  
pp. 32873-32888 ◽  
Author(s):  
Xiao-fang Lv ◽  
Jiang-wei Zuo ◽  
Yang Liu ◽  
Shi-Dong Zhou ◽  
Da-yong Lu ◽  
...  
Keyword(s):  
Experimental Study ◽  
High Pressure ◽  
Growth Kinetics ◽  
Deep Water ◽  
Oil And Gas ◽  
Flow Properties ◽  
Field Development ◽  
Water Transportation ◽  
Oil And Gas Pipelines ◽  
Kinetics Of

The formation and accumulation of hydrates in high pressure oil and gas pipelines bring great risks to field development and deep-water transportation.

Application of ASME Section VIII Division 3 Design Requirements to Offshore High Pressure Equipment

2013 ◽  
Author(s):  
J. Robert Sims
Keyword(s):  
High Pressure ◽  
Oil And Gas ◽  
Local Strain ◽  
Pressure Vessels ◽  
Stress Concentrations ◽  
Section Viii ◽  
Design Requirements ◽  
Offshore Oil And Gas ◽  
Materials Used ◽  
Offshore Oil

Offshore oil and gas wells are being drilled into formations that have pressures up to 200 MPa (30,000 psi) and temperatures over 175°C (350°F). Most of the existing API Standards for pressure equipment, such as valves and blow out preventers (BOPs), are limited to pressures of about 100 MPa (15,000 psi). The design requirements in ASME Section VIII Division 3, Alternative Rules for Construction of High Pressure Vessels (Div. 3), can be adapted for the design of this equipment with some modifications. Since the strength of the materials used in these applications is limited due to environmental cracking concerns, it is necessary to accept some local yielding in areas of stress concentrations. Therefore, it is particularly important to apply the elastic-plastic analysis requirements in Div. 3 with appropriate limits on local strain as well as the robust fracture mechanics based fatigue analysis requirements. Paper published with permission.

Measurement of Corrosion Potentials of the Internal Surface of Operating High-Pressure Oil and Gas Pipelines

2008 ◽  
Vol 5 (6) ◽  
pp. 101244 ◽  
Author(s):  
Alebachew Demoz ◽  
Sankara Papavinasam ◽  
Kirk Michaelian ◽  
R. Winston Revie ◽  
S. Papavinasam ◽  
...  
Keyword(s):  
High Pressure ◽  
Oil And Gas ◽  
Internal Surface ◽  
Gas Pipelines ◽  
Oil And Gas Pipelines

Performance Evaluation of Alternating Current Square Waveform Submerged Arc Welding as a Candidate for Fabrication of Thick Welds in 2.25Cr-1Mo Heat-Resistant Steel

2020 ◽  
Vol 142 (4) ◽  
Author(s):  
Uttam Kumar Mohanty ◽  
Yohei Abe ◽  
Takahiro Fujimoto ◽  
Mitsuyoshi Nakatani ◽  
Akikazu Kitagawa ◽  
...  
Keyword(s):  
High Pressure ◽  
Arc Welding ◽  
Submerged Arc Welding ◽  
Pressure Vessels ◽  
Heat Consumption ◽  
Welding Parameters ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Flux Consumption ◽  
Submerged Arc

Abstract The paper evaluates the performance of alternating current (AC) square waveform submerged arc welding (SAW) as a candidate technology for manufacturing thick welds for high-pressure vessels. A new mathematical formulation for calculating melting efficiency in square waveform arc welding is presented. The melting efficiency and the heat consumption are presented as a mathematical model of welding parameters, namely welding current, welding speed, current frequency, and electrode negativity (EN) ratio. The proposed approach is demonstrated through the welding of 2.25Cr-1Mo heat-resistant steel performed over a wide range of welding parameters. The investigation provides deeper insights into the interplay between process parameter, total heat consumption, and melting efficiency. The effect on flux consumption is also explained. The melting efficiency is inversely proportional to flux consumption. The welding heat does not necessarily promote the plate melting. Improper use of welding heat may lead to decreased melting efficiency and increased unwanted melting and consumption of welding flux. Compared to the conventional direct current (DC) power sources, the AC square waveform welding achieves almost the same order of melting efficiency with added advantages of better weld bead shape and flux consumption in a desirable range. The two additional parameters (frequency and EN ratio) of the AC square waveform power source provide more freedom to fine-tune the process and thereby efficiently use welding heat. The results of this investigation will be advantageous to the designers and fabricators of high-pressure vessels using AC square waveform welding.

Failures of Chemical Injection Points in Upstream Facilities

2009 ◽  
Vol 83-86 ◽  
pp. 579-591 ◽  
Author(s):  
A.S. Al-Omari ◽  
Khalid M. Al-Nabulsi ◽  
Ali F. Al-Mari
Keyword(s):  
High Pressure ◽  
Phase Separation ◽  
Service Life ◽  
Oil And Gas ◽  
Gas Production ◽  
Materials Selection ◽  
Injection Point ◽  
Oil And Gas Production ◽  
And Control ◽  
Control Corrosion

Chemicals play an important role in the enhancement of oil and gas production and processing. They control corrosion, prevent organic and inorganic deposits, aid in phase separation and control microbial problems. Several factors can have significant impact on the safety, maintenance, operation, and service life of the chemical injection point. Failures encountered in the high pressure retrievable chemical injection points are presented. This paper also provides guidelines for materials selection and design of chemical injection points in upstream facilities.

Precision arc welding of high-pressure vessels with alternate pulsed supply of shielding gases

2013 ◽  
Vol 27 (12) ◽  
pp. 986-989
Author(s):  
O.M. Novikov ◽  
A.S. Persidsky ◽  
E.P. Radko ◽  
B.A. Khasyanov ◽  
I.A. Samokhin ◽  
...  
Keyword(s):  
High Pressure ◽  
Arc Welding ◽  
Pressure Vessels ◽  
Shielding Gases
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