Tubular products in pipe mills are produced by different methods in wide range of sizes and materials for various applications . From simple ERW steel tubes to high quality and expensive seamless tubes, depending on the application, different NDT techniques are used extensively. All these tests are implemented to fulfil the required specification or standard as well as for condition monitoring ...

The influence of temperature, vibration time, amplitude, and other factors on the residual stress release effect was studied using method low-temperature heating high-frequency ultrasonic vibration, excellent control parameters were obtained. In addition, cutting weld reinforcement also studied. results demonstrate that highest relative rate 280.29%, average over 150 MPa, efficiency higher than...

Quality of welded joint at MAG welding process depends of numbers of influences, like type and thickness of base metal, groove type, welding position etc., but the proper selection of welding parameters is also very important. Due to that, the analysis of weld bead geometry at MAG welding process with regard to weld current, voltage and weld speed (heat input) and the type and shielding gas flo...

The influences of ultrasonic vibration during cold metal transfer welding process on the microstructure, element distribution and pitting resistance AISI 430 ferritic stainless steel joints with ER 308L as filler were investigated. combined effects mechanical vibration, acoustic streaming cavitation significantly refined primary ferrite grain in weld then impacted subsequent solid-phase transit...

The heat-affected zone in a welded structure is vulnerable to attack by corrosion. Unfortunately, if corrosion occurs, then detection of such areas via a local visual inspection is often difficult because of limited access, and such an inspection may also incur significant time and associated cost penalties because of downtime. One such example, where access is difficult and corrosion may occur...

Abstract Ultrasonic welding of plastics has been used in a wide range industries and improving quality production speed are still important issues. This paper introduces method to evaluate the condition during welding. In this method, vibrations propagated were acquired using piezoelectric element. By fast fourier transform analysis, tracking calculation data, total harmonic distortion with tim...

Process monitoring is important for the laser welding system, especially for the weld seam deviation monitoring. A 10kW high power fiber laser butt joint welding of type 304 stainless steel was performed. By combing two different band pass filters, high speed photography was employed to capture the near-infrared images of molten pools. Image difference algorithm was used to obtain the weld seam...