Cold working can improve or alter the surfaces of metal products. Peening is a cold working process where the surface of the metal is blasted by shot pellets.

This induces compressive stress in the region just below the skin to compensate for the stretching of the skin. When a tensile load is applied on this residual compressed load, the net effect is a reduced amount of stress on the part. This makes the metal well suited for fatigue applications which involve cyclic loads-such as gears, crankshafts etc.

Most weldment surfaces are under tension due to shrinkage after being exposed to welding heat. Peening can reduce tensile stress by inducing compressive stress on the part. In this type of application peening is done by using hammers.


Sinotech offers an exceptionally wide range of secondary processes that are applied to metals formed in hot or cold processes. Sinotech’ Supplier Quality Engineers determine the availability of the process within the metal forming facility, as well as the quality. If the internal secondary processes do not meet Sinotech standards then the processes are carried out in Sinotech-audited and qualified off-site secondary processing facilities. Sinotech has audited, qualified and worked with QS-9000 and ISO certified secondary processing facilities in China, Taiwan and Korea for over 12 years. Sinotech is dedicated to managing your project on-site and delivering parts to you at lower prices but the same quality, service and terms as a domestic supplier.

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