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

The invention discloses a cold bending thin-wall steel beam column node, which comprises a square steel tubular column (1), a square steel tubular beam (2) and a C-shaped steel beam (3). The steel beam column node is characterized in that the C-shaped steel beam (3) is welded on the square steel tubular column (1), and the square steel tubular beam (2) is welded on the C-shaped steel beam (3). The C-shaped steel beam (3) and the square steel tubular column (1) can be connected by self-tapping screws (7). The cold bending thin-wall steel beam column node overcomes the defect of the conventional cold bending thin-wall steel beam column node connection; and the node has the advantages of definite stress transfer pathway, predominant earthquake resistance and simple and feasible construction operation, can be widely applied to connection of sections of various cold bending thin-wall steel rods, and is particularly suitable for a structural system adopting a plug-in retaining wall.

The invention discloses a construction method for single-side fusion-through welding of connection angle seams of closed longitudinal ribs and a bridge deck slab. The construction method comprises the following construction steps that the multiple closed longitudinal ribs and the bridge deck slab are assembled so that a bridge deck slab unit can be formed, the bridge deck slab unit is installed on a bed-jig of a slab unit welding production line horizontally, and welding backings are installed at the two inside longitudinal angle seams; the longitudinal angle seam located on the outer portion is welded by rotating the bed-jig; the other longitudinal angle seam located on the outer portion is welded by rotating the beg-jig; and the bed-jig is rotated to be in the horizontal state, and the bridge deck slab unit subjected to welding is removed. By means of the construction method, the problems that due to incomplete penetration of one-side welding of closed longitudinal ribs and a bridge deck slab, a fatigue crack source exists, and consequently fatigue cracks are caused can be solved, welding penetration of fillet welds of the closed longitudinal ribs can be effectively prevented, the effect that the depth of fusion of the fillet welds of the closed longitudinal ribs meets the design requirement can be ensured, full penetration and excellent molding of the fillet welds of the closed longitudinal ribs of a steel structure are achieved while the production efficiency is improved, and the service life of the steel structure is prolonged.

The invention relates to the technical field of boiler welding repair, in particular to a preheating boiler outer cylinder welding repair method. The preheating boiler outer cylinder welding repair method comprises the following steps of determining the position of a defect, cleaning the periphery of the defect, determining a repair welding area according to the shape and size of the defect, and marking the repair welding area; heating the marked area, wherein the size of the heating area is 10-15mm from the repair welding area as the center; knocking the marking area in a red hot state to enable the marking area to be concave on the surface of the cylinder body; according to the size of the sunken area, embedding the corresponding repair plate into the sunken area, and welding the repair plate into the sunken area; smoothing the weld joint; and carrying out flaw detection on a weld zone of the boiler outer cylinder, and carrying out a hydrostatic test after flaw detection. The method solves the problems that in the prior art, when corrosion spots of the boiler outer cylinder are welded and repaired, repair plates are directly added for welding, consequences such as welding leakage, poor welding and weld penetration at the welding position are likely to be caused, and even larger defects are caused, the welding effect is good, and the efficiency is high.

The invention discloses an automatic welding gun head for tube-shell thin tube plate embedded deep hole welding. The structure comprises a guide cavity tube, an insulation cavity tube and a nozzle module; one end of the insulation cavity tube is fixedly connected with the end part of the guide cavity tube; the length of the welding gun head is elongated through the guide cavity tube to conveniently realize deep hole welding of a tube plate; a copper base is fixedly connected into a cavity at the other end of the insulation cavity tube, and is fixedly connected with the nozzle module; the nozzle module includes a tungsten pole; a tip part of the tungsten pole includes a first smoothing angle and a second smoothing angle; the second smoothing angle is larger than the first smoothing angle; and the double smoothing angles of the tip of the tungsten pole can centralize arcs to facilitate quick through welding of the tube plate and a heat exchange tube. The automatic welding gun head further comprises an arc pressure tracker; and the arc pressure tracker can detect the arc voltage change during welding to adjust the position of the tungsten pole so as to effectively prevent the through welding phenomenon under the condition of through welding as far as possible.

The invention discloses a straight pipe welding system. The straight pipe welding system comprises a welding gun, a wiggler, an automatic wire feeding machine and a roller wheel frame, wherein the welding gun is fixedly connected with the wiggler and comprises an electric parameter setting unit which is used for setting electric parameters when a motor of the welding gun works; a straight pipe to be welded is arranged on the roller wheel frame, and the roller wheel frame is used for driving the straight pipe to be welded to rotate; the wiggler is used for driving the welding gun to swing along the welding joint between the to-be-welded end of the straight pipe to be welded and a component to be welded; the wiggler comprises a control unit which is used for controlling the swinging period of the wiggler; and the automatic wire feeding machine is used for feeding a solder wire to a welding gun head, and the welding gun is used for welding the welding joint through the welding gun head. The straight pipe welding system provided by the invention can improve the welding efficiency of the straight pipe, reduce air pores, lower the weld penetration probability, improve the uniformity of the welding joint, and guarantee the welding quality.

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 discloses a method used for efficiently welding straight seams of an air conditioner compressor shell. The technical problems that when straight seams of an existing air conditioner compressor shell blank are welded, welding quality is poor, and welding efficiency is low are mainly solved. The method used for efficiently welding the straight seams of the air conditioner compressor shell comprises the steps that (1) the to-be-welded surface of a steel plate is cleaned; (2) an air conditioner compressor shell blank is prepared; and (3) the air conditioner compressor shell blank iswelded, a small hole type plasma welding process is adopted, the butt joint straight seams of the rolled steel plate are welded, a plasma welding process is adopted, in the welding process, the shellblank is controlled to move along the center of a welding seam to achieve welding, the welding current is 200-240 A, the arc voltage is 25-31 V, and the welding speed is 750-850 mm / min. The method ishigh in welding efficiency, good in welding quality, easy and convenient to operate and low in welding cost.

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 relates to the technical field of boiler welding repair, in particular to a welding repair method for preheating the outer cylinder of a boiler, which includes the following steps: determining the position of the defect, cleaning around the defect, and determining the welding repair area according to the shape and size of the defect, Mark the repaired welding area; heat the marked area, the size of the heated area is centered on the repaired welding area plus an area of ​​10~15mm; tap the marked area in a red hot state to make the marked area concave on the surface of the cylinder; according to the dent According to the size of the area, the corresponding repair plate is embedded in the recessed area, and the repair plate is welded in the recessed area; the weld is smoothed; the weld area of ​​the outer cylinder of the boiler is inspected, and the hydraulic test is carried out after the inspection is free of defects. The invention solves the problems in the prior art that when welding repairs to the corrosion points of the outer cylinder of the boiler, directly adding a repair plate welding is likely to cause welding leaks, poor welding, welding penetration and other consequences at the welding place, and even cause larger defects, and the welding effect is good. ,efficient.

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 large-span reinforced truss floor deck of a high-rise building, which comprises several bottom formworks and several steel bar trusses. The upper bearing plate, the upper bearing plate includes a buckle plate, a splicing plate and a buckle, the splicing plate and the buckle plate cooperate with the steel bar truss through the buckle, and the invention also discloses a production of a large-span steel bar truss floor deck for a high-rise building The process includes the following steps: preparing the bottom formwork; assembling the steel bar truss; assembling the steel bar truss floor deck; improving the structure of the steel bar truss floor deck on the basis of the prior art, changing the existing single-layer bottom formwork into a double-layer , to avoid grout leakage, and use the mutual fit between the buckle plate and the splicing plate, so that the upper bearing plate can be fixed with the steel truss, thus realizing the purpose of avoiding welding through the bottom formwork, further improving the risk of avoiding grout leakage, and making the steel bar Truss floor decks can be used in high-rise buildings.

Provided is a one-side welding and double-side forming method for a T-shaped connector of a closed supporting structure; a welding groove of the closed supporting structure is processed, the closed supporting structure and a bottom plate are assembled, and a gap is formed between the welding groove of the closed supporting structure and the bottom plate; and a closed annular welding area between the closed supporting structure and the bottom plate is welded by adopting a welding mode of combining symmetrical welding and leapfrogging welding and a welding method of manual electric arc welding. The groove form and size of the closed supporting structure are reasonably designed, the truncated edge thickness heat dissipation condition of an adopted V-shaped groove form is superior to that of a U-shaped groove, weld penetration can be effectively prevented, the assembly clearance is controlled, the welding process is optimized, the assembly precision requirement and misalignment sensitivity can be reduced, one-side welding and double-side forming of the T-shaped joint are effectively achieved, the back of a root is ensured to be fully fused, and meanwhile, the defects of root penetration or undercut and the like are avoided.

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.