Abstract: Electromagnetic acoustic transducer(EMAT) is a new technology for ultrasonic nondestructive testing based on the physical principles of Lorentz force and magnetostriction. As an ultrasonic testing(UT) method, it has all the benefits of UT compared with other methods. Instead of generating sound in the transducer, EMAT generates ultrasonic waves on the surface of a test part. Therefore, compared with conventional piezoelectric transducers, EMAT testing has the benefit of no couplant, non contact, feasible for extreme low or high temperature, and convenient for industrial automation. In addition, EMAT is very convenient to generate SH waves and all types of guided waves. Dedicated to the development and commercialization of EMAT technology, Innerspec technologies has developed more than 150 industrial EMAT inspection systems for steel, automobile, oil and gas transportation, pressure vessel, and power generation industries. As a UT technique EMAT is suitable for thickness measurement, flaw detection, and material characterization. In this paper, we will focus our discussion on a few applications of weld inspection. The first application is a laser weld inspection in tailor welded blanks, in which guided waves are used to inspect the thin plates. The second application is an inline inspection of electric resistance weld(ERW) tube using circumferential guided waves. The thickness of the tube varies between 1.5mm and 8mm. The third application for thick austenitic welds in power industry is using angle beam EMAT phased array and our 8 channel high power portable EMAT instrument.