What is the minimum yield point of welding material to use when the parent metal is unknown?

When it comes to welding materials, especially when the parent metal is unknown, it's crucial to choose a welding material that has a yield point that is sufficient to ensure the strength and integrity of the weld. The minimum yield point specified serves as a guideline to ensure that the weld can withstand various stresses without failure.

In this case, a yield point of 46 kg/mm (or 65,000 psi) provides a solid balance of strength while considering the unknown variables associated with the parent metal. It is strong enough to create a reliable bond that can endure operational stress typical in container applications.

Choosing a welding material with a yield point lower than this level may not ensure adequate performance or safety, especially when working with metals of uncertain quality or properties. Therefore, establishing a minimum yield point based on industry standards helps mitigate risks associated with unknown material properties and reinforces the overall structural reliability of the weld.