IS 800:2007 Rule for Fillet Welding Painted Steel

When performing fillet welding on steel that has been delivered and painted, it is crucial to prepare the surface correctly to ensure a strong and reliable weld. The presence of paint can interfere with the welding process, leading to defects and reduced weld strength.

According to the Indian Standard code for steel structures, IS 800:2007, specific requirements are laid down for the preparation of steel surfaces before welding. This includes removing any substances that might affect the weld quality.

The code specifies that for fillet welding, if the steel is painted, the paint must be completely removed from the area around the joint where the weld is to be made. The distance over which this paint removal is required is clearly defined in the standard.

Based on IS 800:2007, the paint must be removed for a minimum distance on either side of the joint. This ensures that the weld is made directly onto clean steel surfaces.

• The paint shall be removed for a distance of at least 50 mm on either side of the joint.

This rule is essential for achieving proper fusion and preventing issues like porosity, slag inclusions, and lack of penetration in the fillet weld. Removing the paint ensures good electrical contact and allows the welding arc to operate correctly, resulting in a sound weld that meets the required strength and quality standards as per IS 800:2007.