What is a potential cause of porosity in welds?

One of the potential causes of porosity in welds is excessive arc length. When the arc length is too long, it can lead to an uneven distribution of heat and improper melting of the base materials. This situation may cause gas pockets to form as the weld metal solidifies, resulting in porosity. Additionally, a longer arc length may prevent sufficient shielding gas coverage, allowing contaminants and moisture to enter the weld pool, further contributing to the formation of gas bubbles that become trapped as the weld metal cools.

Understanding the relationship between arc length and weld quality is crucial for welders aiming to achieve sound and defect-free welds. By maintaining an appropriate arc length, the welder can ensure proper fusion and minimize the risk of porosity, leading to stronger welds that meet the required specifications of the Structural Welding Code.