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提高焊接接头的耐疲劳强度,可通过表面塑性变形的办法硬化焊缝和近缝区来实现。许多工厂已积累了有关焊接管接头环形焊缝液力喷珠硬化的很多经验。这种管接头乃是壁厚为2.5-4.5毫米的30XГCA号钢管,管的两端焊有连接件,焊后进行热处理,达到б_B=115±10公斤·力/毫米~2。在使用过程中,焊接接头要承受很大的轴向静拉力载荷和交变动载荷。通常,破坏中心位于靠近焊缝边缘的加热区。
To improve the fatigue resistance of welded joints, plastic deformation by the surface approach to weld and seam near the seam to achieve. Many factories have accumulated a great deal of experience with hydraulic bead hardening of annular joints in welded pipe joints. The fittings are 30X CCA steel tubes with a wall thickness of 2.5-4.5 mm. The ends of the tube are welded with connections and heat treated to a strength of б_B = 115 ± 10 kg · m / mm². During use, welded joints are subject to large axial static tensile loads and alternating dynamic loads. Normally, the center of destruction is located in the heating zone near the edge of the weld.