When using RT to examine a statically loaded non-tubular groove welded tension member in 3/4" thick plate, what is the maximum size of fusion discontinuity permitted?

The maximum size of fusion discontinuity allowed in a statically loaded non-tubular groove welded tension member made of 3/4" thick plate is determined by industry standards and specifications, such as those outlined by the American Welding Society (AWS). These standards stipulate that for particular types of welds and gauge thicknesses, there are limits on discontinuities to ensure the structural integrity and performance of the welds under load.

A fusion discontinuity refers to a lack of complete fusion within the weld which can lead to weaknesses in the weld, especially in tension members where forces are applied. For the 3/4" thick plates in this scenario, the allowable size of a fusion discontinuity is set at 1/2".

This limit is established to maintain sufficient strength in welded connections, preventing defects that could compromise the safety and reliability of the welded structure. In practice, allowing only smaller discontinuities would require more stringent standards and testing, but 1/2" is deemed acceptable for maintaining the balance between weld quality and practical manufacturing processes within the specified conditions for this kind of application.

Consequently, the choice of 1/2" aligns perfectly with these guidelines, which dictate that the performances of such welds are reliable and