The Core Technology of High-Strength Connections —— The Hardcore Strength of Riveting and Welding Processing

In industrial manufacturing, the strength of workpiece connections directly determines the reliability of equipment. Riveting and welding processing, with its dual processes of "riveting + welding", has become the core solution for high-strength connections. It uses the precise fusion of metals to build an unbreakable connection defense in large structures and precision components, demonstrating its "hardcore" technological strength.

The high strength of riveting and welding processing first stems from the "molecular-level fusion" of the welding process. In the splicing of main beams of steel structure bridges, submerged arc welding technology uses the 6000℃ high temperature generated by electric current to melt the edge of the steel into a liquid molten pool. The added welding wire fully blends with the base metal, and after cooling, a weld seam with the same strength as the base metal is formed. To eliminate welding stress, the weld seam is also subjected to stress relief annealing at 250℃, so that the tensile strength of the connected part can reach more than 90% of that of the base metal. This process of "melting-fusion-strengthening" makes the separated workpieces an integral mechanical whole, which is not easy to break even under the load of ten thousand tons.

The riveting process makes up for the limitations of welding with "mechanical locking". On the body of mining machinery with severe vibration, high-strength bolts are used for riveting at key parts: first, CNC drilling is used to ensure that the coaxiality error of the bolt holes does not exceed 0.1mm, and then a torque wrench is used to tighten the 8.8-grade high-strength bolts with the specified torque, so that the connected parts generate permanent pre-tightening force and form a tightly fitting friction surface. This connection method has excellent fatigue resistance. Under long-term alternating loads, the pre-tightening force of the bolts can remain stable, avoiding cracks in the welded joints due to vibration. The combination of riveting and welding achieves the complementarity of "rigid connection" and "flexible buffering".

The "hardcore" nature of riveting and welding processing is also reflected in its adaptability to complex structures. When processing large pressure vessels, circumferential seam welding is used between cylinder sections to ensure tightness, while the connection between flanges and cylinder sections uses a combination of riveting and welding: first, spot welding is used for positioning, then symmetrical welding is used to prevent deformation, and finally, rivets are used to reinforce the corners. This not only meets the pressure resistance requirement (up to more than 30MPa) but also can cope with thermal expansion and contraction caused by temperature changes. This combination of processes enables the connected parts to withstand internal pressure and have a certain deformation redundancy, which is far superior to a single connection method.

From the frame of the ten-thousand-ton hydraulic press to the body of high-speed trains, riveting and welding processing defines the standard of high-strength connections with the dual guarantee of "fusion + locking". Its hardcore strength lies not only in its ability to achieve amazing bearing capacity but also in its flexibility to adjust the process combination according to different working conditions, making every connection a reliable cornerstone for the safe operation of equipment —— this is precisely the irreplaceable value of it as a core technology.