Check of welds according to Hong Kong Code

Welds are designed according to Cl. 9.2 – Simplified method.

Butt welds

Full penetration butt welds are expected and their resistance is considered equal to that of the parent metal – Cl. 9.2.5.2.1.

Fillet welds

Fillet welds are designed by Simplified method according to Cl. 9.2.5.1.6. 

\[ f_w \le p_w \]

  • \(f_w = \sqrt{\sigma_\perp ^2 + \tau_\perp ^2 + \tau_\parallel ^2}\) – vector sum of stresses in weld throat in all directions
  • \(p_w\) – design strength of fillet weld determined according to Table 9.2a and 9.2b; for cases not covered by Tables 9.2a and 9.2b:
    • \(p_w = \min \{0.5 U_e, 0.55 U_s\}\) – for EN electrode used with EN steel
    • \(p_w = 0.38 \min \{U_e, U_s\}\) – for other cases
  • \(U_e\) – minimum tensile strength of electrode
  • \(U_s\) – minimum tensile strength

The effective length of the fillet weld is reduced by \(2\cdot s\) according to Cl. 9.2.5.1.3, where \(s\) is the fillet weld leg size assumed equal to \(a\cdot \sqrt{2}\).



Electrode
Steel grade354250
S 275220220220
S 355220250250
S 460220250280
Steel gradeElectrodeDesign strength
Q235E43160
Q345E50200
Q390, Q420E55220

Tables 9.2a and 9.2b: Design strengths \(p_w\) [MPa]

Welding electrodeMinimum tensile strength \(U_e\) [MPa]
35440
42500
50560
E43421.1
E50526.3
E55578.9

Default minimal tensile strength of electrode \(U_e\) [MPa]

The weld diagrams show stress according to the following formula:

\[ \sigma = \sqrt{\sigma_{\perp}^2 + \tau_{\perp}^2 + 3 \tau_{\parallel}^2 } \]

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