Welding Defects

An ideal weld or good weld should be such that adequate fusion exists between the filler metal and edge preparation together with good penetration. Welding defects are the irregularities that are formed due to the wrong welding process or due to inexperienced welders.

Common Weld Defects In Thermal Power Plants Thermal Power Plant Power Plant Weld

There is a great variety of welding defects.

Welding defects. Welding defects may occur either outside or inside the weld metal. A welding defect is any flaw that compromises the usefulness of a weldment. The defect may differ from the desired weld bead shape size and intended quality.

What is Welding Defects. Defects in the girth weld are located and measured by radiography or ultrasound. Consequently codes and standards developed by the American Welding Society specify exactly how a joint must look when the job is completed.

Surface contain irregularities include uneven weld bead ripples excessive weld reinforcement excessively concave or fillet weldconvexs unevenleg fillet weld- s undercut overlap herringbone pockmarks mouse footmarks and underfill. Welding Defects can be defined as the irregularities formed in the given weld metal due to wrong welding process or incorrect welding patterns etc. Welding imperfections are classified according to ISO 6520 while their acceptable limits are specified in ISO 5817 and ISO 10042.

Is can occur when the flux which is the solid shielding material used when welding melts in the weld or on the surface of the weld zone. The weld defect is removed by grinding and subsequent rewelding. The local stresses at the weld repair are intensified during the weld excavation process.

Slag inclusion is one of the welding defects that are usually easily visible in the weld. Welding defects are generated in a welding job due to the faulty or poor technique used by the inexperienced or unskilled welder or due to fundamental difficulties in the welding operation. Aft of the tensioner the pipe undergoing excavation is highly loaded by bending and tension.

Even if irregularities are very minimal but if the shape size and quality of the weld are way different than what is expected it is also called welding defects. In addition to brittleness other common weld defects like distortion cracking and melt-through can compromise the durability of metals including mild steel. Slag is a vitreous material that occurs as a byproduct of stick welding flux-cored arc welding and submerged arc welding.

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