6results about How to "Reduce weld cracking" patented technology

The utility model discloses a laser welding device with a shielding gas heating function, which comprises a laser welding module, a shielding gas heating module is arranged on one side of the laser welding module, the shielding gas heating module comprises a cavity, the cavity is provided with a gas inlet and a gas outlet, a heating rod is arranged in the cavity, and the shielding gas heating module is arranged in the cavity. The air outlet is connected with an air supply pipe, and an outlet of the air supply pipe is arranged below a laser vibration mirror of the laser welding module. According to the utility model, nitrogen reaching a working procedure can be heated in advance, so that the consistency of the temperature of protective gas is ensured; and meanwhile, the shielding gas heating device has a temperature adjustable and controllable function, and the optimal temperature of the shielding gas can be confirmed by discussing the influence of the shielding gas at different temperatures on gas holes and cracks after welding, so that the cooling speed after welding is slowed down, the gas escapes from a molten pool, the probability of generating the welding cracks and the gas holes is reduced, and the welding quality is improved.

The invention relates to the technical field of hybrid welding, in particular to a laser and TIG magnetic control hybrid welding process for a nickel-based alloy pipe production line, which comprises the following steps: pipe manufacturing, preparation, conveying and preheating, welding and cooling, equipment comprises a dust-free welding chamber and a welding pipe, a welding mechanism is arranged in the dust-free welding chamber, and the welding pipe is arranged in the dust-free welding chamber. The welding mechanism comprises a high-frequency pulse TIG welding gun and a laser transmitter, a magnetic field mechanism is arranged in the high-frequency pulse TIG welding gun, and a tungsten electrode end is arranged at the end, away from the adjusting frame, of the high-frequency pulse TIG welding gun. The method has the advantages that optical fiber laser welding is combined with the high-frequency pulse TIG arc and external alternating magnetic field technology, the welding speed is remarkably increased, rapid heating is achieved through optical fiber laser welding, the stirring and mixing effects of a molten pool are enhanced through adding of the high-frequency pulse TIG arc and the alternating magnetic field, the alternating magnetic field stirs the interior of the molten pool, grains are refined, and the overall performance of a welding seam is improved; therefore, thermal stress and deformation of weld metal are reduced, and welding efficiency and quality are improved.

The utility model discloses a bridge crane end beam weld joint cracking repairing structure, which relates to the technical field of hoisting machinery and comprises an end beam, a weld joint is arranged on the end beam, a welding rod is welded in the weld joint, and a support plate is fixedly mounted at the bottom of the end beam and corresponds to the welding rod. A plurality of pairs of transverse reinforcing rib plates are fixedly and symmetrically installed on the two sides of the supporting plate, the transverse reinforcing rib plates are symmetrically distributed on the two sides of the supporting plate at equal intervals, a pair of longitudinal reinforcing rib plates are symmetrically and fixedly installed on the two sides of the supporting plate, and a pair of transverse limiting plates are installed on the longitudinal reinforcing rib plates. A transverse limiting plate is fixedly installed on the end beam, a protruding block is fixedly installed on the transverse limiting plate, two pairs of fixing blocks are fixedly installed on the end beam, the fixing blocks are fixedly connected with the transverse limiting plate, and the problems that in the prior art, when a welding seam of the end beam of the bridge crane cracks, the whole end beam needs to be replaced or large-area repair welding needs to be conducted, and consequently the repair cost is high are solved.

The present invention relates to a laser welding fixture and a laser welding method for an inner tube assembly of an aircraft engine air duct, which belongs to the field of mechanical processing technology, and includes a core shaft, a gland, a first clamp and a second clamp; the core shaft is a cylindrical structure, one end of the core shaft is connected to the gland, and the other end is provided with a flange, the heat shield sleeve is connected to the core shaft surface, and its two ends are connected between the flange and the gland and limited by the first clamp, and a plurality of damping rings are limited to the surface of the heat shield cylinder by the second clamp. The present invention ensures the precise fit between the damping ring and the heat shield through a laser welding fixture, and the precisely positioned damping ring can more effectively control the thermal deformation and cracks during the welding process, which helps to improve the stability and durability of the overall structure, provide a guarantee for the welding method, reduce the error during the welding process, improve the welding efficiency, and meet the production and use requirements.

This invention discloses a manufacturing equipment and method for hot roughing universal joints used in metallurgical steel rolling. The equipment includes a worktable with four support legs at its bottom and a central control system at its top. It also includes a speed-changing support mechanism mounted on the top of the worktable, with two fixing mechanisms on the mechanism. The two fixing mechanisms respectively fix the universal joint and a flange. This supports the universal joint and the flange, enabling synchronous rotation and position adjustment, providing stable support for subsequent welding, straightening, and other processes. This device significantly improves welding quality by refining grains and dispersing impurities through multi-field coupling; avoiding surface damage through non-contact creep straightening; achieving micron-level straightening through ultrasonic rolling; forming a deep residual compressive stress layer to improve fatigue resistance; reducing human error through automated closed-loop control; adapting to various workpiece specifications; and significantly improving efficiency and reducing costs through integrated processing.

The embodiment of the utility model discloses a laser beam combiner and laser welding equipment. The laser beam combiner comprises an input optical fiber, the input optical fiber comprises a central optical fiber and a plurality of outer ring optical fibers, the plurality of outer ring optical fibers are arranged around the central optical fiber, and the power of the outer ring optical fibers is smaller than that of the central optical fiber; the output optical fiber is an annular optical fiber and is used for outputting an annular light spot; the welding module is used for welding and fixing the input optical fiber and the output optical fiber; and the cavity is used for accommodating the welding module, the partial area, close to the welding module, of the input optical fiber and the partial area, close to the welding module, of the output optical fiber. According to the laser beam combiner and the laser welding equipment, the welding efficiency can be improved.