Abstract: Provided is a weaving control method for obtaining an excellent weld quality of various kinds of position welding such as flat welding, horizontal welding, and vertical welding using a portable welding robot that moves on a guide rail.

Abstract: A method of manufacturing a group III-nitride semiconductor includes a loading step, a pressure reduction step, a heating step, a first film forming step, and a second film forming step. In the pressure reduction step, a pressure in the chamber is reduced. In the heating step, the substrate is heated. In the first film forming step, an organic metal gas containing a group III element is supplied to the substrate in the chamber, and a first gas containing hydrogen gas and nitrogen gas is excited into plasma and supplied to the substrate in the chamber. In the second film forming step, an organic metal gas containing the group III element is supplied to the substrate in the chamber, and a second gas not containing hydrogen gas and containing nitrogen gas is excited into plasma and supplied to the substrate in the chamber.

Abstract: In this welding control method for a portable welding robot that moves along a guide rail, for using the portable welding robot to weld a workpiece including a groove: a groove shape detection position is established in at least one location in a welding sector extending from a welding starting point to a welding end point; the groove shape at a groove shape detection position Pn is sensed by means of a detecting means of the portable welding robot, which is moving along the guide rail; groove shape information is calculated from detection data obtained by the sensing; and a welding condition is acquired on the basis of the groove shape information.

Abstract: A main landing gear bay 15 which is formed inward of a fuselage 11 of an aircraft 10 from an opening portion provided in a surface of the fuselage 11 so as to store a main landing gear 13 of the aircraft 10, the main landing gear bay 15 including inclined regions 16 and 17 that are continuous from a rim of the opening portion to the fuselage 11 surface in an airframe axis direction X of the aircraft 10, wherein the inclined regions 16 and 17 are formed so as to have a larger depth toward the rim of the opening portion. Since the inclined regions 16 and 17 are formed so as to have a larger depth toward the rim of the opening portion, the aerodynamic drag acting on the main landing gear bay can be reduced. Accordingly, the fuel consumption of the aircraft can be improved.

Abstract: A main landing gear bay 15 which is formed inward of a fuselage 11 of an aircraft 10 from an opening portion provided in a surface of the fuselage 11 so as to store a main landing gear 13 of the aircraft 10, the main landing gear bay 15 including inclined regions 16 and 17 that are continuous from a rim of the opening portion to the fuselage 11 surface in an airframe axis direction X of the aircraft 10, wherein the inclined regions 16 and 17 are formed so as to have a larger depth toward the rim of the opening portion. Since the inclined regions 16 and 17 are formed so as to have a larger depth toward the rim of the opening portion, the aerodynamic drag acting on the main landing gear bay can be reduced. Accordingly, the fuel consumption of the aircraft can be improved.

Abstract: The present invention has as its object the provision of a restoration method for a deteriorated part, which is capable of easily and reliably repairing and restoring a deteriorated part generated in a metal member to reliably prolong the lifetime of the metal member. Specifically, a local heating step of locally heating a deteriorated part C by a main heater 25 and pressure-welding the deteriorated part C by a compression force by thermal expansion and a peripheral heating step of heating the periphery and vicinity of a heated region HA1 in the local heating step by a sub heater 26 are carried out, followed by carrying out a cooling step of cooling the heated region HA1 by the main heater 25 and a heated region HA2 by the sub heater 26 at the same time.

Abstract: A water heater is arranged with the hot water storage chamber R1 at the top and the combustion chamber R2 at the bottom within the body 11 which is a container. The combustion chamber R2 is equipped with the air supply inlet 13a, and the flame arrester 27 is provided at the air supply inlet 13a. Within the combustion chamber R2, the main burner 22 and the pilot burner 25 are provided, the changing state of flame of the pilot burner 25 is detected by the thermocouple 26, and a controller 41 closes an electromagnetic valve for opening and closing the main gas passage, stops the combustion of the main burner 22 as well, and rings the alarm 44. In a alternate embodiment, a sensor burner 60 is used as a safety device to detect a state of flame of the sensor burner and to shut off fuel to the main gas burner.

Abstract: The trouble occurring followed by air supply shortage due to the clogging of the flame arrester is prevented.

Abstract: A water heater is arranged with the hot water storage chamber R1 at the top and the combustion chamber R2 at the bottom within the body 11 which is a container. The combustion chamber R2 is equipped with the air supply inlet 13a, and the flame arrester 27 is provided at the air supply inlet 13a. Within the combustion chamber R2, the main burner 22 and the pilot burner 25 are provided, the changing state of flame of the pilot burner 25 is detected by the thermocouple 26, and a controller 41 closes an electromagnetic valve for opening and closing the main gas passage, stops the combustion of the main burner 22 as well, and rings the alarm 44. In an alternate embodiment, a sensor burner 60 is used as a safety device to detect a state of flame of the sensor burner and to shut off fuel to the main gas burner.

Abstract: An ultrasonic detecting apparatus includes a transmitting element for emitting an ultrasonic wave toward a surface to be probed inside a sample from a surface of the sample at a predetermined angle. The ultrasonic detecting apparatus also includes a receiving element for receiving the ultrasonic wave reflected from the surface of the sample. The transmitting element and the receiving element are separated from each other on a single pedestal and are movable on the surface of the sample in a direction perpendicular to the surface to be probed. A distance between the transmitting element and the receiving element is arbitrarily changeable.

Abstract: A connecting clamp includes a heating member which surrounds a portion to be connected of a steel pipe and heats the portion to be connected, and a first clamp section and second clamp section positioned on opposite sides of the portion to be connected and clamping the steel pipe, whereby the portion to be connected is connected by heating the portion to be connected by the heating member while applying pressure to the portion to be connected by the first and second clamp sections. The first and second clamp sections and the heating member are so arranged as to be slid around the outer surface of the steel pipe from one side of the steel pipe to the other side thereof.

Abstract: A connecting clamp includes a heating member which surrounds a portion to be connected of a steel pipe and heats the portion to be connected, and a first clamp section and a second clamp section positioned on opposite sides of the portion to be connected and clamping the steel pipe, whereby the portion to be connected is connected by heating the portion to be connected by the heating member while applying pressure to the portion to be connected by the first and second clamp sections. The first and second clamp sections and the heating member are so arranged as to be slidable around the outer surface of the steel pipe from one side of the steel pipe to the other side thereof.

Abstract: A connecting clamp (4) comprises a heating member (9) which surrounds a portion to be connected of a steel pipe (1) and heats the portion to be connected, and a first clamp section (6) and a second clamp section (7) positioned on opposite sides of the portion to be connected and clamping the steel pipe, whereby the portion to be connected is connected by heating the portion to be connected by the heating member while applying pressure to the portion to be connected by the first and second clamp sections. The first and second clamp sections and the heating member are so arranged as to be slid around the outer surface of the steel pipe from one side of the steel pipe to the other side thereof.

Abstract: The trouble occurring followed by air supply shortage due to the clogging of the flame arrester is prevented.

Abstract: A high strength steel strand for PC of a wire material having a pearlite structure and containing 0.80 to 1.30% of C, 0.60 to 2.50% of Si and 0.30 to 1.50% of Mn, remainder being Fe and unavoidable impurities, wherein a cementite portion of the wire material comprises a mixed structure of fibrous cementite and granular cementite, the volumetric proportion of the granular cementite to the total cementite is 10 to 40%, the particle diameter of the granular cementite is 40 to 300.ANG., and the strand has a tensile strength of 235 kgf/mm.sup.2 or higher and an elongation of 3.5% or greater.

Abstract: A plasma CVD apparatus whose discharge electrode is a single line member bent in a U shape in an alternating manner and in which a substrate to be processed is held substantially in parallel to the discharge electrode. The electric field around the electrode becomes stronger and the intensity distribution of this field becomes even. As a result, a product film formed on the substrate surface has a uniform thickness, and the film can be formed at high speeds.

Abstract: Facilitating the distinction among different spring steel products and at the same time improving their surface appearance and corrosion resistance by plating the surface of said different spring steel products before spring-forming with either alternate layers of Cu and Zn or alternate layers of Ni, Cu and Zn, the amount of Cu and Zn differing for steel products differing in size and/or material, to obtain color-developable spring steel products, drawing and taken coil spring-forming the resulting plated spring steel products, and low temperature annealing said resulting plated spring steel products to develop their colors, the colors being different for spring steel products differing in size and/or material, whereby mixing and erroneous assembly of spring steel products differing in size and/or material is prevented.

Abstract: A plasma-chemical vapor-phase epitaxy system or a chemical vapor deposition (CVD) system can produce a large thin film of good quality. The CVD system includes a vacuum container having a quartz glass window, a substrate disposed within the vacuum container as opposed to the window, an antenna type discharge electrode disposed outside of the vacuum container as opposed to the window, and a high-frequency power supply for feeding electric power to the same electrode. In this way, by disposing an electrode outside of a container and exciting the reaction gas with high-frequency electromagnetic waves, a large thin film of good quality can be formed.