12 results about "Shielded metal arc welding" patented technology

The invention relates to the technical field of welding processes, in particular to a welding process method for optimizing martensitic stainless steel welding three-zone hardness, which comprises the following steps: welding by adopting gas metal arc welding, and controlling heat input to slow down the cooling rate; dual tempering heat treatment is carried out after welding, specifically, the first tempering temperature is 650-700 DEG C, and after first tempering, standing is carried out for a preset time length, and cooling is carried out to the room temperature; tempering for the second time at the temperature of 580-620 DEG C; wherein the base material is ultra-low carbon martensitic stainless steel, and the welding material is a nickel-molybdenum alloy welding wire matched with the base material. According to the method, gas metal arc welding is adopted for welding, and heat input is controlled to slow down the cooling rate; double tempering heat treatment is carried out after welding, the hardness of a weld zone, a fusion zone and a heat affected zone is eventually homogenized, and synergistic improvement of hardness homogenization and corrosion resistance is achieved.

The invention discloses a martensite heat-resistant steel G115 large-diameter thick-wall pipe welding and heat treatment process which comprises the following steps: step 1, performing groove processing on a to-be-welded position of a pipeline, and cleaning and preheating the to-be-welded position of the pipeline; 2, in the welding process, pulse argon arc welding is adopted for the root of the groove, flux-cored wire gas shielded welding is adopted for filling layer welding, low-hydrogen type shielded metal arc welding is adopted for capping layer welding, when filling and capping welding are conducted, segmented symmetrical synchronous welding is adopted for the welding sequence, the groove is divided into even number segments in the circumferential direction, and the number of the segments is equal to the number of the segments; two welders are used for synchronously welding at symmetrical positions; thirdly, after welding is completed, the welding position is subjected to slow cooling, high-temperature tempering and segmented cooling in sequence; through the design of dynamic heat input adjustment, segmented protection, precise temperature control heat treatment and the like, the cold crack risk is reduced, heat affected zone grain coarsening is restrained, residual stress is eliminated, and the mechanical property and service stability of a welded joint are improved.

The invention relates to the technical field of welding automation, in particular to automatic welding equipment and method.The automatic welding equipment comprises a base, a walking mechanism, a visual recognition module, a welding execution unit, a welding unit and a control unit, the walking mechanism adopts Mecanum wheels with the wheel faces made of flexible magnetic attraction materials, so that the walking mechanism has the omni-directional moving capacity and the high adhesion capacity; the visual recognition module is used for weld joint positioning and real-time molten pool monitoring, the welding execution unit comprises a multi-degree-of-freedom mechanical arm and a clamping assembly and can achieve all-position posture adjustment of a welding gun, the welding unit can be configured to be shielded metal arc welding or flux-cored gas arc welding, and the control unit controls the welding unit to conduct welding on the basis of molten pool characteristics fed back visually. Compared with a preset model, parameters such as the welding current, the voltage, the walking speed and the welding gun angle are dynamically adjusted in a closed-loop mode, intelligent self-adaptive control over the welding process is achieved, the welding quality stability and the operation adaptability are improved, and manual dependence is reduced.

The utility model belongs to the technical field of pressure vessel equipment manufacturing, and particularly relates to a gas metal arc welding semi-automatic device for equipment surfacing, which is characterized in that a vertical rod is fixed on a movable bottom plate vehicle, and one end of a horizontal rod is connected with the vertical rod through a fixed jacketed pipe; the horizontal rod has the freedom degree of vertical lifting and horizontal translation relative to the vertical rod, the other end of the horizontal rod is connected with the supporting pipe through the hinge type jacketed pipe, and the supporting pipe has the freedom degree of horizontal translation and pitching swing relative to the horizontal rod. One end of the supporting pipe is connected with a shielding gas source, the other end of the supporting pipe is closed, a shielding gas hood and a fixing clamp are fixed to the supporting pipe, and a gas shield welding gun can be installed on the fixing clamp in a relative movement mode. And protective gas enters from the supporting pipe and then is conveyed to the protective gas hood. The device can replace the operation that a welding worker holds a welding gun by hand, the manual welding time is shortened, the welding efficiency is improved, and the labor intensity of the welding worker is reduced.

This invention proposes a high-efficiency welding method for closely spaced pipes, belonging to the field of welding technology. It solves the problems in the industry where manual shielded metal arc welding (SMAW) is mainly used for fillet welds of closely spaced pipe joints. This method results in high labor intensity for welding operators, low production efficiency, and weld quality that is greatly affected by the operator, making it difficult to guarantee weld quality. This invention uses solid carbon dioxide gas shielded welding wire; employs a deep-penetration, low-spatter pulsed power supply; and determines the welding sequence as a left-hand welding method. Using solid welding wire for gas shielded welding of pipe joints improves production efficiency and reduces production costs. Compared with the commonly used SMAW method, solid welding wire reduces fume generation, purifies the operating environment, and improves the company's environmental protection level.

The application provides an abnormality detection method and device for shielded metal arc welding. The method comprises the following steps: after shielded metal arc welding is started in a constant current mode, a first voltage and a first current are acquired in real time; an arc voltage is determined based on the first voltage, the first current and a first resistance obtained in advance; an actual arc resistance is determined based on the first current and the arc voltage; and an abnormality detection process is performed on the shielded metal arc welding based on the actual arc resistance and a preset standard arc resistance. According to the method, whether the welding is abnormal can be determined by detecting the change of the arc resistance, the abnormality detection process can be performed in time when the shielded metal arc welding is abnormal, the occurrence of welding defects can be effectively avoided, the intelligentization of the shielded metal arc welding is realized, and the welding efficiency is improved.

The present application belongs to the technical field of steel material and steel material welding, and proposes a gas shielded welding method for a martensitic bulletproof steel with a hardness of 600HBW. The method adopts a shielded metal arc welding method, a direct current reverse polarity power supply, and a rich argon mixed protective gas. According to the low strength matching principle, a solid welding wire is selected. The same plate thickness combination butt joint is continuously welded in a multi-layer and multi-pass manner. The preheating temperature of the steel plate is 100-150 DEG C, the welding line energy is controlled at 10-15 KJ / cm, and the welding joint is slowly cooled after welding by using asbestos. The present application ensures that the welding joint meets the shaping and toughness requirements, has high yield strength and tensile strength, the yield strength of the welding joint is greater than 1300 MPa, and meets the bulletproof performance requirements after welding. For the low alloy ultra-high strength martensitic bulletproof steel with a hardness level of 580-640HBW, the welding joint and the base material do not have cracking and other problems after welding.

In gas shielded arc welding, the goal is to enable stable arc starting regardless of the welding method. [Solution] In an arc start control method for gas shielded metal arc welding using welding wire or filler wire, the method includes at least a retract control period in which retract control is performed from the start of welding until the transition to a steady welding period; a start base period in which, after the retract control, the feed speed is alternately switched between a forward feed period and a reverse feed period, and the feed control method is changed to one cycle in which the forward feed period and the reverse feed period are repeated, and the wire is moved to a predetermined reference value related to the tip position of the welding wire or filler wire; and a start initial condition period in which, after the start base period, predetermined welding conditions are maintained for a predetermined period in the feed control method.

This invention discloses a welding process for connecting a gray cast iron interface flange and a low-carbon steel transition flange. By creating a bevel on one side of the gray cast iron interface flange, and using a combination of manual argon arc welding and shielded metal arc welding with φ3.2mm Z116 welding rods and φ3.2mm and φ4.0mm E5015 welding rods, an optimized welding process is employed to sequentially complete the welding of the transition layer, the root pass, the filler layer, and the capping layer. This effectively solves the production problems of leakage and the inability to replace parts in the bolted connection between the gray cast iron interface flange and the low-carbon steel transition flange of the blast furnace top residual pressure energy recovery power equipment reducer box. The process not only provides stable welding quality and high work efficiency, but also ensures safety, ease of operation, and low maintenance costs, effectively meeting the actual needs of the site and reducing operation and maintenance costs.

The application provides an automatic welding device for gas shielded welding, comprising: a workpiece, at least comprising a first side plate; a welding gun device, a first end of the welding gun device penetrating the first side plate and extending to the inside of the workpiece, the first end of the welding gun device being provided with an image acquisition device for acquiring image information in the workpiece, and a second end of the welding gun device being connected with a driving motor; a sliding displacement mechanism, comprising a sliding block fixedly connected with the workpiece and a sliding channel for the sliding block to slide thereon; a support frame, the support frame being fixedly connected with the first side plate and being used for supporting the welding gun device; and a fixing device provided on the support frame and used for fixing the welding gun device. The welding gun device provided by the application realizes accurate control and automatic operation of the welding process, and improves the welding efficiency and quality. The application provides a flexible welding gun fixing mode, which allows accurate adjustment of the height of the welding gun.

This invention discloses a gas shielded metal arc welding (GSMA) narrow-gap welding torch, comprising a conductive structure, a nozzle structure, and a gas support structure. The conductive structure includes a conductive nozzle with a wire feeding channel. The nozzle structure, made of high-temperature resistant insulating material, is fitted outside the conductive structure and includes a first nozzle section and a second nozzle section connected to the first nozzle section, the second nozzle section being configured as a flat structure. The gas support structure includes at least one anti-collision post, which is arranged laterally to the second nozzle section along its length. A second gas supply channel for delivering shielding gas is provided axially within the anti-collision post, the output direction of the second gas supply channel being consistent with that of the first gas supply channel. This GSMA narrow-gap welding torch is suitable for narrow-gap welding of thick materials, and it features high reliability, high safety, and good stability, greatly improving welding quality and efficiency.

In gas-shielded arc welding, stable arcing can be carried out in any welding method. The arcing control method in gas-shielded metal arc welding using a welding wire or a filler wire comprises at least: a retraction control period in which retraction control is performed from the start of welding to the transition to a stable welding period; a reference period is activated, and after the retraction control, the feed control method is changed to a feed control method in which the feed speed is alternately switched between a forward feed period and a reverse feed period and the forward feed period and the reverse feed period are repeated as one cycle. Transitioning to a predetermined reference value related to the tip position of the welding wire or filler wire; and a start-up initial condition period in which, after the start-up reference period, under a predetermined welding condition, the feed control method is maintained for a predetermined period.