The alloy sample ablation using a welding torch normally can not meet the local thermal equilibrium (LTE) standardization due to a relatively low burning temperature, thus this will lead to some detection limits, such as full-noise signals in consecutive samples, matrix effect and a fluctuated and inaccurate electronic temperature measurement, etc. A short-pulse laser (NdYAG) is brought in parallel to the sample surface and focused about 1 mm above it to form a pre-ablation spark for a few microseconds before the welding torch, which is focused orthogonally on the alloy sample, ablates the surface and forms the plasma and spectrum signals. With this method, large laser-inducted breakdown spectroscopy (LIBS) signal enhancements, 45-fold most, as well as enhanced signal-to-noise ratio and electronic temperature, are observed comparing to the signal generated by a welding torch only. Also, the results affected by the negative delay time of this pre-ablation short-pulse laser and the geometric position of the detective optical fibers are also discussed.