What is a common result of insufficient heat input during welding?

Insufficient heat input during welding typically leads to weak weld joints, which is a critical concern in the integrity and performance of the welded assembly. When there isn't enough heat, the base metal may not reach the necessary temperatures required for effective melting and fusion. This can result in inadequate penetration and bonding between the base metal and the filler material, leading to a weak joint that may fail under stress or load.

A weak weld joint can compromise the entire structure, making it susceptible to cracks or complete failure under operational conditions. It's essential in welding to achieve a balance in heat input to ensure proper melting and fusion; otherwise, the structural integrity of the weld is jeopardized.

Other results like increased spatter, excessive smoke production, and improper bead appearance may occur due to various other factors such as incorrect electrode type, travel speed, or shielding gas issues. However, these are not as directly linked to the concept of insufficient heat input in terms of compromising the strength of the weld joint.