I just starting working for T. Karlson & Associates of Texas. I'm new to welding and i am having problems with welding the two together. Working with wire feed Magnatec wire feed R1 head. When welding samples to get the schedule right its fine but when I switch to the couplers its hit and miss. Out of four sent to x-ray only one passed. I can up the wire down the amps or vise versa then slow it down and speed it up. Never consistant results, not sure the only thing i have left is we arn't sure if the coupler made of NTRC 50 is material match or if its chemical match. Any help would be much appreciated.