61results about How to "Good welding condition" patented technology

The present invention is RE containing Zn-Al alloy wire and its preparation process, and the RE containing Zn-Al alloy is used as the end spraying material for metallized film capacitor. The RE containing Zn-Al alloy contains Al 4-16 wt%, RE mixture with light RE as main components 0.01-0.12 wt%, and impurity not more than 0.025 wt% except Zn. The preparation process includes pouring Al molt into Zn molt, raising the temperature for melting while stirring, adding intermediate RE alloy, and smelting while stirring to obtain the RE containing Zn-Al alloy. The RE containing Zn-Al alloy wire of the RE containing Zn-Al alloy has compact structure, improved machining performance and use performance, and improved welding condition.

A laser welding method including a step of welding upper and lower metal plates, a step of picking up an image of a molten pool near a molten hole from the side of the upper metal plate during an execution of the welding step, a step of determining whether a welding state of the metal plates is proper or not by analyzing a generation state of the molten pool based on the image picked up in the picking-up step, and a step of adjusting at least one of a parameter of the irradiated laser beams and a feeding speed of the filler wire so that the welding state of the metal plates becomes proper in case the welding state determined in the determining step is not proper.

A laser welding method of the present disclosure has a first step and a second step. In the first step, a first workpiece and a second workpiece are overlaid in a first machining region. In the second step, the first workpiece and the second workpiece are irradiated with laser beam in the first machining region while the laser beam is moved in a spiral path. Moreover, in the second step, the first workpiece and the second workpiece are melted by irradiation of the laser beam to form a liquid phase portion. Furthermore, in the second step, the laser beam is moved so that the liquid phase portion is not irradiated with the laser beam again.

The present invention relates to a chain welding machine used for the butt welding of the chain link resistors with the help of the extrusion butting welding. The chain welding machine has a rack, a control shaft used for controlling the motion function of the chain welding machine in time, a chain conveying device used for conveying the chain links that are not welded to the welding positions andexporting the welded chain links from the welding position after the welding operation, an electrode assembly having at least one pair of electrodes that can be provided to the to-be-welded chain link end parts and used for conveying a welding current and two block forging steel racks supporting movably, wherein the block forging steel racks are arranged at the relative sides of the welding positions and are used for bearing the block forging steels used for transmitting the block forging forces and the block forging paths to the chain links at the sides facing each other. A block forging system acting on the block forging steel racks and used for providing the block forging forces and the block forging paths according to the specified block forging progress is designed to programme a block forging curve irrelevant with the control shaft by utilizing the definable correlation between the block forging paths and a time progress and can be programmed freely.

The invention provides a multielectrode gas-shield arc welding method and a multielectrode gas-shield arc welding device. A welding pass can be good in appearance, the shape of the welding pass is prevented from deforming and the stability of a fusing metal accummulating portion can be achieved even if high-efficiency welding by three electrodes is performed. The multielectrode gas-shield arc welding method is a method using the multielectrode gas-shield arc welding device (S) which comprises a first electrode (11), a follow-up electrode (21) and a central electrode (31) between the first electrode (11) and the follow-up electrode (21). The multielectrode gas-shield arc welding methos is characterized in that the distance between the first electrode (11) and the follow-up electrode (21) is set to be 15mm to 50mm, direct currents with reversed polarities flow across the first electrode (11) and the follow-up electrode (21), and alternate currents with the fixed current characteristics or decreasing characteristics are made to flow across the central electrode (31) for welding.

The invention relates to an LED with an improved soldering structure, a method of assembling the LED to a PCB, and an LED assembly manufactured by the method. The LED includes an LED chip and a pair of leads with an end electrically connected the LED chip and the other end to be connected to an external power source, having a hole or a cutout part formed therein. The LED also includes a package body housing a part of the lead in the side of the LED chip, and a transparent lens placed on a surface of the package body in the side of the LED chip, for emitting light laterally. This improves soldering conditions for soldering with the other end of the lead placed on the solder, saving the amount of a solder paste while enhancing bonding strength after soldering.

The invention discloses an experimental device for flexible closed-loop control over ERW pipe weld joint opening angles. The device comprises a high-frequency generator, an output device of the high-frequency generator, a CCD vidicon, a computer and five pairs of small rollers. Two electrode contacts are symmetrically fixed to a pipe blank located on a workbench with a weld joint as the center line, high-frequency currents form a circuit through the two electrode contacts and the pipe blank, the five pairs of small rollers are arranged in the manner that the appearance dimensions are gradually reduced in proportion and are sequentially in contact with the positions, at the two sides of the center line of the weld joint, of the surface of the pipe blank, and a pressure senor is mounted in a base below each small roller. The pressing amount of each pair of small rollers is changed by changing the axial distance and the radial distance between the pair of small rollers to obtain the opening angles different in size and shape. A closed-loop system is formed by the CCD vidicon, the computer and the pressure sensors, the precision of the sizes and shapes of the opening angles is guaranteed, optimal welding conditions can be obtained by carrying out experimental analysis on the sizes and shapes of the opening angles, and the quality of a welded pipe can be improved.

The invention provides a thermal compression welding method. A thermal compression welding machine is utilized to weld at least two wire rods in different wire diameters at the same time. The thermal compression welding method includes the steps that a pressing head of the thermal compression welding machine is placed at the starting position, and the temperature of the pressing head is controlled to gradually rise to the preset temperature T1 from the normal temperature; the steps of downwards pressing the pressing head and adjusting and controlling the temperature are repeatedly executed till the pressing head makes contact with the wire rod in the minimum wire diameter, and the welding time of the pressing head on the wire rods in all wire diameters is kept tn; the pressing head continues to be pressed downwards and the temperature of the pressing head rises to the preset temperature Tn, core wires of all the wire rods and tin points of bonding pads at the corresponding positions are made to be fused, then the temperature of the pressing head is controlled to be lowered, and welding points are formed on the end portions of the wire rods; and when the temperature of the pressing head is lowered to the preset separation temperature, the pressing head and the welding points are separated, and welding ends. By means of the thermal compression welding method, soft wire rods in various wire diameters can be sequentially fused till welding is completed, the welding speed is high, and the welding quality is high.

A method is provided for modifying a surface of a first, relatively difficult-to-weld metal substrate in preparation for a subsequent joining method by applying a thin layer of a second, relatively easy-to-weld metal to the surface of the first metal substrate.

The invention discloses an ultrasonic-assisted semi-solid welding method. The ultrasonic-assisted semi-solid welding method includes steps of cleaning base metal by the aid of ultrasonic waves; fusing and cooling welding flux; adding semi-solid into the welding flux in cooling procedures and stirring the semi-solid; cooling the welding flux until the temperature of the welding flux reaches 600-630 DEG C, and then pouring the welding flux into a constant-temperature injecting machine to keep the temperature of the welding flux constant; heating the welding base metal and carrying out ultrasonic-assisted vibration on the welding base metal; opening a discharge outlet of the constant-temperature injecting machine to start to inject the welding flux; shifting an in-situ induction heater and the constant-temperature injecting machine by 20 mm, then applying specific pressures on original positions of welding seams by the aid of rolling pressure heads, keeping the rolling pressure heads to move towards non-welded regions along the welding seams at the speeds identical to the speeds of the in-situ induction heater and the constant-temperature injecting machine, keeping the specific pressures unchanged in moving procedures and ultimately obtaining welded components. The components which are high in mechanical property and good in service performance can be obtained by the aid of the ultrasonic-assisted semi-solid welding method by means of welding, and the ultrasonic-assisted semi-solid welding method has the advantages of wide applicable material ranges, high production efficiency, good welding conditions and the like. Besides, the ultrasonic-assisted semi-solid welding method has great development prospects and application spaces.

The invention discloses a forming process of a moderate-thickness plate no-back-gouging butt joint full-penetration class-I component and relates to a moderate-thickness plate tailored-welding forming process. The forming process comprises the steps of preparing plates, cutting the plates to form process grooves, performing tailored welding on the plates, adding ceramic backings, iron liners, clamps and process triangular plates, performing single-side welding on the clamps and the process triangular plates to form single-side welding beads, adding a leading-in arc plate and a leading-out arc plate, welding two moderate-thickness plates, dismounting the ceramic backings, the iron liners, the clamps, the process triangular plates, the leading-in arc plate and the leading-out arc plate, polishing and repairing the single-side welding beads, performing ultrasonic inspection on the single-side welding beads, encoding and marking qualified products and performing next working procedures. The quality of weld joints is guaranteed, butt-jointed plates do not easily deform, production efficiency is high, on-site butt joint operation is quick and easy, lots of manpower resources can be saved, the labor intensity of workers can be reduced, and production cost can be reduced.

The invention discloses a diffusion connection method of a cylinder wall structure. The diffusion connection method comprises the following steps of putting an inner cylinder wall in liquid nitrogen for 20-30 min and then rapidly mounting the inner cylinder wall into an outer cylinder wall to form a combined workpiece; conducting high-temperature diffusion welding on the combined workpiece and realizing diffusion connection of inner and outer cylinder wall structures through required diffusion welding pressure generated by deformation and interference installation of the workpiece at high temperature, wherein the inner diameter of the outer cylinder wall of the cylinder wall structure is 0.02-0.2% greater than the outer diameter of the inner cylinder wall; the temperature and time requiredfor diffusion connection are determined by the inner and outer cylinder diameter difference; the welding temperature can be reduced by 2-5 DEG C and the temperature holding time can be reduced by 1-2min every 0.01% increase in the outer diameter difference. By means of the diffusion connection method, the structure and process are simplified, and the uniformity and product quality of the weldingsurface can be improved; the diffusion connection method is applicable to welding conditions of columnar, conical, trapezoidal cylindrical and various cylinder wall structures.

The invention provides a piping for refrigeration, a production method and application. The piping for refrigeration is compounded from a plurality of metal layers, wherein the metal layers comprise a metal base layer, a side wall formed on the metal base layer and at least one copper cover layer used for being welded with an external part. The piping for refrigeration provided by the invention can totally replace the composite structure of a piping and a connecting piece of the conventional refrigeration device, so that the welding procedure is greatly decreased, and the welding cost is reduced.

The invention provides a welding workpiece clamping device with a multi-angle adjusting function. A supporting rod is welded to the upper end of a base. A height adjusting device can slide up and down, and the supporting rod is horizontally and rotationally sleeved with the height adjusting device in a 360-degree mode. A fastening bolt is arranged on the height adjusting device. Welding positioners are horizontally, rotationally and movably installed at the two ends of the height adjusting device in a 360-degree mode. Welding clamping devices are movably installed at the other ends of the welding positioners correspondingly. By adjusting the positions of weld joints, adjustment of the weld joints in rigorous positions and special-shaped structure forms is achieved, the welding quality and efficiency of workers are improved, and potential safety hazards are avoided.

The invention discloses a bimetal composite tube which comprises an outer tube, connecting portions and an inner tube. The connecting portions are arranged at one end or two ends of the bimetal composite tube, the connecting portions and the inner tube are made of identical materials, the inner diameter of each connecting portion is consistent with that of the outer tube, and the wall thickness of each connecting portion is not smaller than the wall thickness of the outer tube; the outer tube is connected with the connecting portions by means of welding; the inner tube is tightly combined with the outer tube and the connecting portions by a certain forming method; the ends of the inner tube and the ends of the connecting portions are subjected to seal welding, so that corrosive media in pipelines are guaranteed against being in contact with the outer tube. The bimetal composite tube has the advantages that special materials among the connecting portions of the composite tube and the outer tube are welded in a manufacturing plant, so that a welding condition is good, quality inspection can be strictly executed conveniently, the welding strength can be guaranteed, only welding of the same type of metal needs to be completed during field construction, and the requirement on the connection strength between the pipelines can be met; the connecting portions are made of the corrosion-resistant materials, so that corrosion of the connecting portions can be prevented, and the delivery safety performance of the bimetal composite tube can be guaranteed.

The joint has a shaft (5) and a ball joint (7,11) frictionally welded with one another as separate components in an electrical resistance manner. A spigot (8) is formed at the ball joint, and the shaft is welded with the spigot. The shaft is formed with two fork ends in a region of a connection with the ball joint. The shaft is formed as a tubular semi-finished material with an integrated screw thread (3). A chamfer is welded with the ball joint. A weld seam (9) is moved from a surface area of the ball joint into a region of a transition between the spigot and the chamfer at the shaft. The joint provided in the invention has the advantages of low manufacturing cost, reliable manufacture, small stress concentration effects and high fatigue strength, especially low manufacturing cost and high part strength.

Disclosed herein is a spindle motor including a shaft; a sleeve having a hollow cylindrical shape so as to rotatably support the shaft; and a cover closing an opened lower portion of the sleeve. This spindle motor is characterized in that the cover and a lower portion of the sleeve are arranged in parallel with each other and adhered to each other by a horizontal butt welding method.