Explanation: When there is an addition of some microelements in the slag along with a few nonmetallic inclusions, there is an increase in the strength of the mild steel arc weld. The maximum amount of strength goes up to 57 kgf/mm2, which is 570 N/mm2.

Explanation: A multi run process causes a good amount of grain refinement. With every proceeding run weld, it normalizes its previous run. In ordinary steels, grain refinement takes place in the second run.

Explanation: When there is an addition of some microelements in the slag along with a few materials being present which are not metals, there is an increase in the strength of the mild steel arc weld. The minimum amount of strength goes up to 43 kgf/mm2, which is 430 N/mm2.

Explanation: The contour present on the welds form notches. The contours in the form of notches then affect the low temperature properties of the structure and also the fatigue properties.

Explanation: The reaction that takes place in between compounds and elements is known welding with solid reactants. These reaction are exothermic, that is give out heat as a product. Thermit reaction is a common example for this, which is mixture of aluminium and rust.

Explanation: The amount of solubility of gas in liquid or solid welded metals is considered to be an essential criteria for the control of porosity of the weld. The gas reactions which occur, then regulate porosity.

Explanation: Slags used in welding are generally a combination of silica materials and some carbonate compounds. In fusion welding, some amount of bead control has to be done, which is done by the slags, for this purpose, to improve its performance, microelements like manganese are added.

Explanation: The stresses which get developed in welding during shrinkage are of importance. These stresses are considered to be an important factor which are responsible for the cracking that occurs in metal welds.

Explanation: None.

Explanation: Slags used in welding are generally a combination of silica materials and some carbonate compounds. In fusion welding, some amount of bead control has to be done, which is done by the slags, for this purpose, to improve its performance, microelements like nitrogen are added.