Table 3.

Ultimate limit sizes of welding imperfections in the form of gas pores in accordance with PN-EN ISO 13919-1:2002 standard [33].

Ultimate Limit Sizes of Welding Imperfections in Relation to Quality Levels
Lenient requirements D	Medium requirements C	Strict requirements B
l or h ≤ 0.5 t or 5 mm; lower value applies, f ≤ 6%	l or h ≤ 0.4 t or 3 mm; lower value applies, f ≤ 2%	l or h ≤ 0.3 t or 2 mm; lower value applies, f ≤ 0.7%

Key: l—length of a welding imperfection (measured in any direction), h—dimension of a welding imperfection (height, width), t—thickness of an element subjected to welding, f—gas pore or gas cavity projection areas. Calculations: h = 500 μm = 0.5 mm, t = 10 mm. 0.5 mm ≤ 0.3 × 10 mm, 0.5 mm ≤ 3 mm, 0.5 mm ≤ 2 mm. Satisfied requirements of quality level B.