Final answer:
Proper fusion for a butt joint should be based on the electrode diameter, with recommendations suggesting 8 diameters side-to-side and 15 diameters deep for optimal strength and quality of the weld. Welding standards may vary, so it is important to refer to relevant codes.
Step-by-step explanation:
The consideration for proper fusion into the side walls on a butt joint is crucial in ensuring the strength and integrity of the welded joint. In welding, the fusion depth and width are important parameters that must be adhered to for achieving a strong and reliable joint. While an older rule of thumb recommended a fusion of 5 diameters side-to-side and 7-8 diameters deep, recent advancements and investigations in welding techniques suggest that optimal results may be achieved with as much as 8 diameters side-to-side and 15 diameters deep.
This means that the fusion into the side walls should be at least equal to 8 times the diameter of the electrode used for side-to-side fusion and at least equal to 15 times the diameter of the electrode for the depth of fusion.
These recommendations serve to maximize the quality of the weld and minimize the risk of weaknesses or failures in the joint. However, it is always crucial to refer to specific welding codes and standards relevant to the work being performed, as these measurements can vary based on the materials being welded and the exact application of the weld.