Home/Technical Glossary/Laser Seam Welding Laser Seam Welding Seam Welding is a variation of spot welding. In laser seam welding, the part to be welded is moved or rotated under the focus head allowing laser spot welds to overlap. Key parameters for laser seam welding are the pulse repetition rate, measured in pulses per second (Hz) and the linear part travel rate or welding speed. Spot overlap percentage (a function of speed), pulse repetition rate and focused spot diameter are also used in the equation for determining the best laser for the job and for determining the total weld cycle time. Laser welding is used to make hermetic seam welds Typical laser seam welding applications include sensors, radar components, battery housing, conductors for thin film cells, pacemaker cases, and insulin pump cases. A good example of laser seam welding can be seen in this video.