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Nd:YAG laser oscillators in two different types were used simultaneously in order to enhance welding ability. A pulse beam emitted from a pulse pumped oscillator was irradiated to stainless steel (304) together with a rectangularly modulated pulse beam emitted from a cw pumped laser oscillator. The deepest penetration of 7.3 mm is obtained at the total average power of 2.9 kW at welding speed of 5 mm/s in a bead-on-plate test. It is nearly equal to the penetration depth of 7.7 mm by two modulated pulse beams at total average power of 4 kW. From these results, it is certified that the pulse beam of high peak power is efficient to increase penetration depth in two laser beam welding. And the plume is extinct after the pulse beam irradiation although the modulated pulse beam is irradiated still. This phenomenon suggests that the pulse beam enlarges a keyhole effectively, deepens penetration consequently.Nd:YAG laser oscillators in two different types were used simultaneously in order to enhance welding ability. A pulse beam emitted from a pulse pumped oscillator was irradiated to stainless steel (304) together with a rectangularly modulated pulse beam emitted from a cw pumped laser oscillator. The deepest penetration of 7.3 mm is obtained at the total average power of 2.9 kW at welding speed of 5 mm/s in a bead-on-plate test. It is nearly equal to the penetration depth of 7.7 mm by two modulated pulse beams at total average power of 4 kW. From these results, it is certified that the pulse beam of high peak power is efficient to increase penetration depth in two laser beam welding. And the plume is extinct after the pulse beam irradiation although the modulated pulse beam is irradiated still. This phenomenon suggests that the pulse beam enlarges a keyhole effectively, deepens penetration consequently.