Visual detection welding defects in dust perception and correction

Abstract EN

The research solve problems of welding defects for dust perception in AL Janoob cement factory .Assembly of steel structures type carbon steel DIN St37 by using manual metal arc welding process and electrode type low hydrogen ESAB 48.00 equivalent to American welding society AWS E7018.

From visual inspection to assembly appeared many welding defects.

In this research used liquid penetration methods helped to detection of fine defect and crack opening to surface that cannot be detection by visual inspection where fined many types of welding such as(under cut, spatter, porosity, nonmetallic inclusion, under fill, excessive reinforcement, surface roughness, arc strikes) defects due to pin holes restricted in welding joint (appear by given cross section in many welding joint by visual inspection and liquid penetration also we don’t using other method of inspection because acceptable requirement only visual and liquid penetration) and others because used of high welding current and welding travels speed.

These problems solved by removing welding defects and re-welded by using drier electrode (250°C for 4hr) and using the proper welding current and speed.