In the first European Community Respiratory Health Survey (ECRHS I), an excess asthma risk was associated with high exposure to gases and fumes, mineral and biological dusts. In a 9-year follow-up study (ECRHS II), the aim was to study if welding at work increases the risk of asthma symptoms, wheeze and chronic bronchitis symptoms. The study also aimed to identify specific welding risk factors....

Welding technology is a key aspect of the manufacturing industry. With application aluminum alloy expanding to more applications, demand for advanced welding constantly increasing. The process requires multi-output power supply improve quality. In this paper, we design novel type converter that outputs dual DC or single AC according different requirements and analyze its working principles in d...

Laser beam welding is becoming widely used in many industrial applications. This paper reviews recent research conducted on the performance, potential and problems of thick section butt joint laser welding. Common defects that occur in laser beam welding with high power laser welding are discussed and possible solutions proposed. Methods of welding process efficiency improvement are analyzed.

Multi-output power converters using different architectures can have significant efficiency advantages. This paper proposes a multi-output welding supply that is based on the middle DC converter distributed architecture. machine includes two groups, and each group comprises three-phase rectifier unit, full-bridge HF (high frequency) transformer, chopper unit. Among these units, unit convert AC ...

Welding is a very important part of the development and growth industry because it has role in engineering, reparation, construction. Shielded Metal Arc (SMAW) or conventional arc welding process particularly dominant structural joints, pressure vessels maintenance repair work. In welding, different metals are joined economically at much faster rate as compared with other fabrication processes ...

1 ATE-80212044©Asian-Transactions September 2012 Study the Effect of Welding Joint Location on the Fatigue Strength and Fatigue Life for Steel Weldment Dr.Ali Sadiq Yasir Kufa University / Faculty of Engineering Mechanical Engineering Department IRAQ E-mail:[email protected] / [email protected] Abstract: The welding process is one of the oldest joining processes between the ma...