For welds of the same type, which one offers superior overall performance?

Welding quality reveals true craftsmanship.

The patterns visible to the naked eye are more than just aesthetics. Porosity, cracks and insufficient filler material can create hidden safety hazards.

Porosity, cracks, and incomplete filling can all harbor safety hazards.

A neat, uniform fish‑scale weld features complete fusion and dense bead texture, balancing good appearance and structural strength.

Think: Among the six welds shown in the picture, which one do you believe offers higher reliability?

1: While the fish-scale weld appearance is aesthetically pleasing, the weld reinforcement is insufficient and the filler metal is inadequate, rendering it only marginally acceptable. It is suitable only for non-load-bearing components and must not be used in the primary load-bearing sections of a truss.

2: Excessive weld spatter, irregular bead formation, and high stress concentration render the weld non-compliant; use in load-bearing applications is prohibited.

3: Extensive porosity and internal voids result in a drastic reduction in strength, rendering the part a total loss.

4: The weld bead is undersized, with insufficient penetration and fill; load-bearing capacity is poor—non-compliant.

5: The weld bead is full and uniform, free of porosity and cracks, and exhibits a favorable stress state; it is the preferred weld type for load-bearing trusses.

6: A crack extending through the entire thickness is visible; this constitutes a critical safety hazard. The item must be immediately scrapped and its use is strictly prohibited.