The ultrasonic wave is applied as an inspection method for the gas-holder and the pipeline in service. In such an inspection, the application of an automatic inspection system is desirable, because a manual inspection is difficult to accomplish perfectly and exactly due to its enormity, a so-called nondestructive inspection robot is then preferable. However, an ultrasonic nondestructive inspect...

The causes of longitudinal crack in gas pipeline during pressure were analyzed by means mechanical property test, microstructure analysis, sem analysis and energy spectrum analysis. results show that the leakage L415M spiral submerged arc welded pipe is caused contact between base material steel low-melting copper alloy process high temperature, resulting brittleness liquid metal. Specifically,...

Engineering fatigue fracture failure is one of the most common phenomena of mechanical and structural failure, statistically representing approximately 50 to 90% of total mechanical damage [1]. Lattice structures have been widely used in crane booms, steel plants, parking garages, offshore platforms and other fields [2] to [4]. In a crane, the lattice boom has better mechanical properties compa...