OTC DAIHEN, initially known as OTC America (Osaka Transformer Company), set up its first office in Charlotte, NC, in 1979. Originally a supplier of welding equipment for other transplant companies, OTC America soon became a leader in the Japanese automotive market as a provider of gas metal arc welding supplies.


In the late 1970's, OTC Japan developed its first generation of dedicated arc welding robots. The first of these robots, THOR, launched in 1981. OTC America entered the robotic business in North America in 1983, and continued to refine automation welding with its ALMEGA line of robots. In 1985, OTC Daihen became the official OEM supplier of robots to Miller Electric Co.

In 1995, Miller announced its departure from the robotics business. In order to maintain the high volume of robots installed, as well as to continue selling to new users, OTC DAIHEN launched its Dynamic Robotic Division and moved its U.S. headquarters to Ohio.

The first robots sold in the United States with the OTC DAIHEN name utilized the Dynamic Robotics (DR) Controller. This was followed by release of the EX series in 2001, the AX series in 2003, the AII series in 2008 and the FD series (current models) in 2012.


In an effort to unify the direction of the company and improve communication, the Welding Power Supplies Division and the Dynamic Robotic Division of OTC Daihen Inc. combined in 2001. The company established its headquarters in the Dayton, Ohio area.

OTC DAIHEN has expanded by adding branch offices in Charlotte, NC; Atlanta, GA; Novi, MI; and Monterrey, Mexico. As we continue to grow, we are dedicated to serving customers by advancing our company mission: Meeting the Challenge.

  • 1919
    OTC (Osaka Transformer Company) founded in Osaka, Japan
  • 1934
    OTC begins producing welding power sources
  • 1979
    OTC America established in Charlotte, NC
  • 1996
    Dynamic Robotic Division established in Ohio
  • 2005
    Regional service centers established in Atlanta, Michigan, Canada, and Mexico

The OT650 was one of DAIHEN Inc.'s early welding transformers.

THOR, The First Robot

DAIHEN Inc. unveiled and demonstrated our first arc welding robot in 1981.