Im building a process for welding heavy assemblies. (2) W14x550 x 41 beams with 2 crossmembers I only have 12 between the flanges and my preheat/interpass is 300 degrees. I essentially have a 300 degree box, 12x16x24 deepI need to put 5/8 fillets in hundreds of these sections.Does anyone make liquid cooled sleeves?How can this be done?