50results about How to "Avoid welding through" patented technology

The invention relates to a welding process for cutter handles, in particular to a cutter handle and a welding method for the cutter handle and a cutter body. The head end of a cutter handle body is in a gradual contraction tapered portion, and a handle plug is encapsulated at the tail end of the cutter handle body; the tapered portion is provided with an outer convex area, an inner concave area and a straight stretching area in sequence along the axis of the cutter handle, and the outer convex area, the inner concave area and the straight stretching area are connected smoothly; a positioning groove concaved along the axis of the cutter handle is formed in the center of the handle plug. The welding method includes the steps that the cutter body is inserted into the cutter groove of the cutter handle, thermal treatment, welding and tempering heat preservation are conducted in sequence, and weld joint grinding and cutter handle surface antiskid treatment are carried out. The cutter handle solves the technical problem that the structure of a traditional cutter handle affects welding quality and welding efficiency; the technical problem that deformation is prone to occurring in a traditional welding method is solved through the provided welding method.

The invention relates to the technical field of welding, and discloses a plasma welding process of duplex stainless steel 2205 with bypass wire feeding, comprising the following process steps: (1) steel plate cutting, (2) welding wire selection, (3) steel plate pretreatment , (4) splicing and positioning of steel plates, (5) installing back protection tooling, (6) filling back protective gas, (7) welding; the welding process parameters are: the polarity of the power supply of the plasma arc welding equipment is DC positive connection, plasma arc welding equipment The tungsten electrode type of the arc welding torch is cerium tungsten electrode WCe‑20, and the diameter is φ4.0mm; the back shielding gas and the welding front shielding gas are a mixture of 98% argon and 2% nitrogen, plasma gas, hood gas It is argon gas with a purity grade of 99.99%; the plasma gas flow rate is 5.5~6.0L / min, the flow rate of the welding front shielding gas and the hood gas are both 25~30L / min, the welding current is 220~240A, the voltage is 26~28V, and the welding speed is 19~21cm / min, heat input 0.98-1.27KJ / mm. The invention can improve welding efficiency, reduce production cost and improve welding quality at the same time.

The invention brings forward an automatic cooling heat sink framework and its refrigeration method, wherein the automatic cooling heat sink framework is used in a low-temperature flow system of space environmental-test facility. The heat sink framework contains a framework main body, a resistor temperature sensor, a liquid nitrogen supply system and a fluid discharge system. The framework main body is shaped as a horizontal cylinder formed by welding an annular pipe and a horizontal pipe and equipped with a lower liquid inlet and an upper liquid outlet, wherein liquids flow horizontally out and in; a liquid inlet pipe is connected with the liquid nitrogen supply system; a liquid outlet pipe is connected with the fluid discharge system; the resistor temperature sensor, which is disposed onthe liquid outlet pipe, is used for detecting the outlet temperature of the heat sink framework. According to the refrigeration method, the temperature of the framework main body is observed by the resistor temperature sensor and the temperature is adjusted by a liquid nitrogen supply valve of the liquid nitrogen supply system so as to finally accomplish the refrigeration of the framework main body. The refrigeration method provided by the invention is utilized to realize the automatic cooling of the heat sink framework, reduce the test cost and allow the temperature of the heat sink framework to be adjusted from 77K to 300K.

The invention provides a method for welding stainless steel optical units without cutting steel belt, and has the advantages of overcoming the defects at the butting parts, satisfying the requirements of laser welding and directly welding without cutting steel belts so as to reduce the production cost. The method comprises the following steps: shielding the border positions on two sides of two steel belts needing opposite side connection; welding the exposed opposite side connection positions through welding equipment to complete the opposite side connection of the two steel belts; placing the integrated steel belt on two steel belt placing frames; forming stainless steel pipes through a longitudinal tubing die after the two steel belt placing frames discharge the steel belts at the same time; welding the shielded border positions on the two sides of the steel belts by a laser continuous welding device in the process of forming the stainless steel pipes in the longitudinal tubing die.

The invention discloses a semi-automatic welding fixture for sheet welding. The semi-automatic welding fixture for sheet welding comprises a fixture frame body, wherein a lead screw and a slide rail parallel to the axis of the lead screw are arranged at the top of the fixture frame body, a nut slide block is in threaded connection to the lead screw, the end part of the nut slide block is arranged on the slide rail in a sleeving manner, and the nut slide block is driven through the lead screw to slide along the slide rail; and a welding gun clamping device used for fixing a welding gun is installed on the nut slide block. The semi-automatic welding fixture for sheet welding is light in weight, capable of being adsorbed onto a weldment, and applicable to semi-automatic welding for a straight welding joint; the fixture is capable of conveniently moving and is moved after one section is welded, and then the next section is welded, so that the long and straight welding joint can be welded; the height and the angle of the welding gun can be randomly adjusted; and a welding tractor is simulated to complete welding in combination with a wire feeding mechanism.

The invention discloses a full-penetration welding technology for fillet seams of a U-shaped rib plate of a steel structure. A steel top plate and the U-shaped rib plate form the steel structure with narrow space, a welding gasket is installed on an internal fillet seam inside the narrow space, an external bevel fillet seam outside the narrow space is welded, and one side welding and double side forming of the steel top plate and the U-shaped rib plate can be realized. According to the full-penetration welding technology, the fillet seams of the U-shaped rib plate can be effectively protected against weld penetration, full penetration of the fillet seams of the U-shaped rib plate of the steel structure can be guaranteed, the front sides and the rear sides of the fillet seams can be well formed, the fatigue resistance of the fillet seams of the U-shaped rib plate of the steel structure can be improved, and the service life of the steel structure can be prolonged.

The invention discloses a pressure-resisting welding method for a circular seam of a pressure container. The pressure-resisting welding method includes the following steps that firstly, a pressure container cylinder is assembled on a supporting rotating frame, insertion connection openings are formed in the end faces of the two sides of the pressure container cylinder in a hitting manner, and an edge milling machine is used for conducting grooving on the outer side of a sealing head of the pressure container and the outer side of the pressure container cylinder; secondly, the sealing head of the pressure container is inserted into the tail end of the pressure container cylinder, a pressure device is applied to the tail end of the sealing head of the pressure container, and positioning welding is conducted on the circular seam; thirdly, a double-wire submerged arc welding machine is arranged at the upper portion of the pressure container, a gas shield welding machine is arranged at theinner bottom of the pressure container, a rotating frame begins to rotate after preheating, and welding is conducted at the same time; fourthly, a pressure container connecting pipe and the pressure container cylinder are assembled and welded; and fifthly, stress-relief annealing is conducted, all-directional detection is conducted on the weld seam, and the interior and exterior surfaces of the pressure container are treated.