CTOD fracture toughness test has been used by a large number of domestic welding workers to assess weld safety. During the construction of offshore oil platform, Offshore Oil Engineering Co., Ltd. applied CTOD fracture toughness test to evaluate the low temperature fracture toughness of welds. The test results showed that the fracture toughness values of most samples at low temperature are qualified for EH36 steel welding joints and heat affected zones with three welding techniques, namely, shielded metal arc welding, single wire submerged arc welding and double wire submerged arc welding without post weld heat treatment, The evaluation of welded joints can be used without post weld heat treatment to shorten the manufacturing cycle of offshore platform structures and reduce manufacturing costs. The whole test work has been well received by Philips Oil Company and DNV Det Norske Veritas.

The rectangular round metal corrugated compensator is one of the auxiliary equipment of the power station flue gas duct. Corrugated round corner rectangular compensator adopts rectangular section, round corner waveform, and a single contraction joint in the pipeline receives two-dimensional displacement. The elbow receiving track composed of two contraction joints can accept three-dimensional displacement. The rectangular fillet metal compensator is available in full height and half height types. According to the flue size, the user can select multi knots according to the stress and strain requirements.