Eurocode 9 Welds (EN 1999-1-1:2007+A1:2009)

Eurocode 9 Welds (EN 1999-1-1:2007+A1:2009) - gives design methods for welded aluminum joints subject to static loading. Section 8.6.3 is implemented covering weld metal strength verification and Heat Affected Zone (HAZ) checks at fusion boundary and weld toe locations.

To add the Standard execute Standards - Main - Other - Eurocode 9 Welds (EN 1999-1-1:2007+A1:2009) from the main ribbon:

Common options are described in the Weld Strength Settings chapter.

Press to Set Standard Custom Settings

Press to set a Characteristic strength values of weld metal (f_w):

f_w factor is obtained from Table 8.8 and represents the characteristic strength of weld metal. This value is used in formula (8.33) for weld verification based on equivalent stress approach and depends on the weld metal type and aluminum alloy combination used in the welded joint:

Characteristic Strength HAZ (f_uHAZ)

Characteristic strength of material in the Heat Affected Zone, obtained from Table 3.2. The value depends on both element thickness and material temper, which is why it's implemented as an Element Characteristic rather than a Material Characteristic. This parameter is used in HAZ F and HAZ T checks for verifying normal stress, shear stress, and Von Mises stress components.

Use detailed approach for HAZ T Check - if checked, a detailed approach for the HAZ T check will be used, i.e. all 4 possible locations checked with forces and moments from the Weld Force Summation Tool adjusted for their respective eccentricity components.

• Simplified approach is based on the assumption that our weld strength implementations don’t check butt welds by default, so it can be safely assumed that in any recognized welded connection there will be at least two plates at a roughly 90-degree angle to each other. In this approach the forces and moments are taken directly from the Weld Force Summation tool and used to check the stresses in two hypothetical failure planes rotated 90 degrees to each other.

• Detailed approach - the forces and moments from the Weld Force Summation tool are adjusted for the eccentricity component (this is done in an extra check 5..Loads (HAZ T) that appears only when this option is turned on) and the design resistance is checked in all 4 possible locations no matter the actual joint geometry. This may result in overly conservative results in some cases, when the resistance is checked at a non-existent location (e.g. T-joint or L-joint). This check also uses the base material cross section in all checked locations (which also might be a limitation if different weld parts have different thicknesses).

Include Eccentricity — When enabled, accounts for additional moment components due to eccentricity "e" in HAZ T calculations. The loads are recalculated when moving the coordinate system from the Weld Force Summation tool location to each HAZ T position, considering the offset distance between the original coordinate system and the actual HAZ T locations.

Gamma_M2 - is applied in weld verification calculations to account for uncertainties in material properties and execution quality of welded connections.