NV E690 is a recently developed martensitic steel and shows excellent strength and is used in manufacturing of offshore platforms. The conventional fusion welding methods are unable to meet the industrial demands related to weld quality, but the hybrid laser-arc welding (HLAW) has this capability. The present work demonstrates the numerical investigation of HLAW of 2.0 mm NV E690 steel to predict influence of welding variables on process temperature and thermal stresses in the weldment. In this work, a three-dimensional (3-D) thermo-mechanically based finite element model (FEM) is utilized using ANSYS software for all numerical investigations. The outcome of present research shows that thermal gradient and stresses may suitably be controlled by controlling the laser power (LP), arc voltage, arc current and welding speed (WS). The process peak temperature decreases with increase in WS while it has increasing nature with increase in LP and arc power, separately. But the normal stresses have decreasing nature with increase in LP and arc power, separately.

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