& nbsp; & nbsp; The high bonding strength that adhesives can achieve is generally only 30-50% of the strength of metal materials themselves. Therefore, in the bonding process, if pure bonding can be combined with mechanical force, the effect will far exceed the bonding degree that can be achieved by using adhesives alone. And by combining the two methods, the stress condition of the joint can be improved, the load can be dispersed, and the performance of impact resistance and anti-aging can be enhanced.
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  & nbsp; & nbsp; Enhanced adhesive patch method

  & nbsp; & nbsp; The pasting method is a method of using fabrics such as glass cloth and cotton white cloth as carriers, immersing them in glue and placing them between two bonded surfaces, and achieving bonding after curing. This method is suitable for situations where there are large gaps between the bonding surfaces. For cracks and small holes in thin-walled parts with less stress, glass cloth (or cotton cloth) can also be sandwiched in the adhesive layer, and after the adhesive liquid solidifies, it forms a fiberglass body, which can provide good reinforcement on the surface. This is a commonly used repair method for damaged parts. When repairing cracks and small holes, it is advisable to apply 13 layers of glass cloth. The bonding strength mainly depends on the first layer, and too many layers can easily peel off< br />


  & nbsp; & nbsp; Enhanced adhesive embedding method

  & nbsp; & nbsp; The embedding method is a method of using embedded parts to apply adhesive and solidify the repaired workpiece. The repaired parts using this method can basically achieve a strength similar to that of the bonding material, and the embedded parts can be in the form of dovetail and keyway. The width of the embedded part is usually three times the thickness of the workpiece wall, and the thickness is 1/3-2/3 of the wall thickness. The interlocking method is suitable for repairing fractured workpieces under high stress, such as gears and racks, hard alloy cutters, etc. However, due to the complex processing and manufacturing of key slots, especially dovetail keys, it is generally not easily adopted.
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  & nbsp; & nbsp; Enhanced adhesive fastening method

  & nbsp; & nbsp; Buckling method is a reinforced adhesive repair method that combines adhesive with various shapes and types of fasteners. The fasteners include bolts, pins, code nails, wave keys, wave grooves, and various shapes of reinforcement components. Due to the fact that these fasteners are pre manufactured and processed, there is no need to specially process them according to the shape of the damaged parts of the repaired parts. Therefore, this method is simpler and more feasible than the embedding method, and the adhesive strength obtained is still very ideal< br />


  & nbsp; & nbsp; Bolt fastening method: The operation steps of bolt fastening method are as follows: 1. Drill crack stopping holes at both ends of the crack first; 2. Drill, tap, and glue along the crack in sequence; 3. Screw in the M5-M8 bolts, and the two bolts should overlap each other by about 1/4; 4. Curing. If conditions permit, it is advisable to drill a hole first, thread and apply glue, screw in the bolt, and then drill a second hole after curing. This will result in a better bonding effect. In addition, the specifications and length of the bolts should be predetermined so that they do not protrude from the surface of the workpiece or screw out through the wall after bonding repair, in order to achieve high bonding strength and maintain the flatness and beauty of the entire workpiece surface.
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  & nbsp; & nbsp; Strong fastening method: This method is suitable for bonding and repairing castings with a wall thickness of 8-40mm. The operation steps are as follows: 1. First, determine the crack pattern on the damaged workpiece, analyze the cause of the fracture, and make a bonding repair plan. 2. Select the wave key. 3. Process waveform grooves in the vertical direction of the crack on the workpiece to be repaired. The fit between the wave key and the waveform groove allows a gap of 0.1-0.2mm, and the depth of the waveform groove is generally 0.7-0.8 times the thickness of the workpiece wall. The arrangement of the waveform groove includes long short and front back types, and the spacing is usually controlled at around 30mm. 4. Use compressed air to blow away the metal shavings inside the waveform groove. 5. Use a small rivet gun to rivet the wave key and fasten it into the wave groove. Apply adhesive to the wave groove and wave key before riveting. 6. Curing< br />


  & nbsp; & nbsp; Strong Tightening Method: This method combines bolt fastening method and strong fastening method, not only using wave keys to firmly bond damaged areas, but also using bolt fastening cracks, making the bonding quality more reliable and the sealing performance good. This method has high practical value and is an effective approach for the adhesive repair and pressure resistant anti-seepage of high-pressure cylinders and high-pressure vessels.