How to calculate heat input

Heat input is a critical parameter for arc welding processes. The Heat input shall be controlled to ensure sound weld quality. Heat input may be defined as “The amount of electrical energy that is supplied to a weld during the welding process”. How to calculate Heat input? There are several ways of calculating the heat input. We shall discuss the two most common methods of calculating the heat input. 1…..

Plasma Arc Welding (PAW)

Plasma arc welding (PAW) is an arc welding process in which the heat required for welding is generated by a constricted arc between a non-consumable electrode and the workpiece. Plasma Arc Welding is essentially an extension of Gas Tungsten Arc Welding (GTAW). Like GTAW, a non-consumable electrode is used in Plasma Arc Welding (PAW). However, a different technique is used to deliver the heat for welding in Plasma Arc Welding….

Acceptance Criteria for Weld Defects

Acceptance criteria for Visual Inspection (Refer: UIG-97, Page – 345 of of ASME BPVC Section VIII Div 1, 2017 Edition.) (a) The surface shall be free of any visible laminations, spalling, or cracks. Cracks in tubes shall not be repaired and shall be considered cause for rejection. (b) For tubes, scratches shall not exceed 1/32 in. (0.8 mm) in depth. For all other material, scratch depth shall not exceed 1/8….

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