Use plasma keyhole penetration to ensure stable and high quality backside shaping; to get faster welding speed, we combine TIG welding for covering to follow the plasma welding to ensure surface stable and high quality shaping. Use P+T welding process, plasma welding in root pass, then TIG welding in cap pass, two torches welding to ensure higher welding speed, faster 1.3-1.5 times than single torch. Use stable industrial controller, ensure the system running long time module design, reduce the time of design and production, good for scale production and maintenance, Otto Arc has more than 10 years experience in using plasma, we have professional teaching material, complete welding process guidance and serve ability.