•Titanium and its alloys are destroyed by the conventional welding process.•Control of welding parameters and heat input can prevent destruction of Ti alloys.•Pulsed laser welding is precise and enables rapid processing with less heat input.•However, rapid cooling rates increase the cracking risk of pulsed laser welding.•Carefully selected laser welding parameters and filler material can prevent cracks. The excellent properties of titanium and titanium alloys, including corrosion resistance, high strength to weight ratio and high operating temperature, have led to their successful application in various fields. However, titanium and its alloys are destroyed by the conventional welding process if welding parameters are not controlled. Laser welding is one of the most reliable methods for use with titanium alloys because of its precision and rapid processing capability. In addition, it enables control of the welding parameters and their effects. In this study, Ti-6Al-4V alloy sheets were welded by Nd: YAG pulsed laser and the potential crack risk on the weld joints was investigated. The optimum results obtained in 3.9kW peak power, better ductility was obtained from the Grade 1 titanium alloy filling material.