Tag: Welding

Welding repair percentage in RT reports equal or less than 3%

Usually large bore piping connection is butt weld

Pre-heating: used to control the formation of H2 cracks

Humidity of fluxes may result porosity or cracking

Pipe thickness more than 8mm welded 2 pass GTAW (root + hot) then SMAW

Pipe thickness less or equal 8mm welded full GTAW

(PQR)procedure qualifications record: suggested procedure of welding which reflected in WPS if accepted

The gap for socket weld 1.5mm to 3mm

Welding equipment require from 33A to 63A

The welding for stainless steel piping require purging by inert gas