In this paper, a fiber optic Fabry–Perot (F–P) cavity high pressure sensor used in oil wells is presented. An F–P cavity probe encapsulated by silica capillary was fabricated through oxy-hydrogen ...flame welding, and the F–P cavity was fully sealed with adhesive-free bonding. A spiral tube filled with silicone oil was chosen to prevent the probe from directly contacting with down-hole corrosion fluid and to transfer pressure. A fiber Bragg grating was linked with the F–P cavity probe to measure ambient temperature for the probe’s temperature compensation. The sensing pressure can be as high as 82 MPa with a sensitivity of 241 nm/MPa, a repeatability of 0.05% F.S.(full scale), a resolution of 0.0004 MPa with the temperature ranging from room temperature to 175 °C. Besides, the maximum fluctuation of the F–P cavity length can be as small as about 0.0072 MPa within 40 days at the pressure and temperature of 42 MPa and 130 °C. In addition, this kind of sensor has been used in Shengli Oil Field.
•An F–P cavity formed by oxy-hydrogen flame welding was sealed without adhesives.•The F–P cavity fabricating device was designed with a rotating and vacuuming device.•A spiral tube was used to avoid touching corrosion fluids and transfer pressure.•FBG was connected to F–P cavity for compensating temperature influence.
In this study, the erosion behaviour of wear-resistant WC/NiCrBSi composite coating deposited by the oxy-acetylene flame welding was investigated. The solid particle erosion wear characteristics of ...the coatings, tribology, and active erosion micro-mechanisms were investigated carefully under three impact angles of 10°, 45°, and 90°. The observations showed that under the low impact angle, the wear behaviour was ductile, and under the normal impact angle, the dominant wear behaviour was brittle. Under the impact angle of 45°, the simultaneous operation of both ductile and brittle behaviours led to a 62% reduction in erosion resistance. Responsible micro-mechanisms for erosion wear under each impact angle were shown by providing accurate images.
This paper presents the factors that may cause pollution of the work environment when working with the oxyacety-lene flame welding process. Experiments were performed using an oven that allows the ...analysis of all gases resulted in the welding process, but also enables their monitoring using a video camera, and the resulting film was processed in that the frames for each second of experimentation were extracted. The materials used in the experiments were S235JR steel as the base material, and as filler materials, E70S. In order to assess the impact on the work environment of this welding process, the pollution coefficient C was defined based on the equation of the material balance.
This paper presents the factors that may cause pollution of the work environment when working with the oxyacetylene flame welding process. Experiments were performed using an oven that allows the ...analysis of all gases resulted in the welding process, but also enables their monitoring using a video camera, and the resulting film was processed in that the frames for each second of experimentation were extracted. The materials used in the experiments were S235JR steel as the base material, and as filler materials, E70S. In order to assess the impact on the work environment of this welding process, the pollution coefficient CP was defined based on the equation of the material balance.
