1 Weld Magnification Factor Approach in Cruciform 2 Joints Considering Post Welding Cooling Medium 3 and Weld Size 4

The objective of this research is to develop an experimental-theoretical analysis about the 11 influence of the cooling medium and the geometry of the welding bead profile in fatigue life and 12 associated parameters with structural integrity of welded joints. A welded joint with cruciform 13 geometry is considered using SMAW, plates in structural steel ASTM A36 HR of 8 mm of 14 thickness and E6013 electrode input. A three-dimensional computational model of the cruciform 15 joint was created using the finite element method. For this model, the surface undulation of the 16 cord and differentiation in the mechanical properties of the fusion zone were considered, the 17 heat-affected zone (HAZ) and base material, respectively. In addition, an initial residual stress 18 field which was established experimentally was considered. The results were a set of analytical 19 expressions for the weld magnification factor Mk. It was found that values for the latter decrease 20 markedly in function of the intensity of the cooling medium used in the post welding cooling 21 phase, mainly due to the effect of the residual compressive stresses. The obtained models of 22 behavior of the weld magnification factor are compared with the results from other researchers 23 with some small differences, mainly due to the inclusion of the cooling effect of the post weld and 24 the variation of the leg of the weld bead. The obtained analytical equations in the present research 25 for Mk can be used in management models of life and structural integrity for this type of welded 26 joint. 27