“FD Grip” The No.1 earthquake-resistant rebar coupler in Japan, the highest seismic country, for over 30 years.
As for the welding, I recorded this video in March of 2016, and have never uploaded it. Downhill progression; I am using a set current; I can very easily adjust pulse settings for a background current and peak current to come in along with a delay, but I did not do that here. I could – which I could completely change the ripple definition of the weld. I had tried to have as high of quality of pipe fitup as possible as well as high of quality of cleanliness as possible disturbance in how the puddle acts. Purge quality – I wasn’t aiming for a particularly good quality purge less than 25 ppm will be silver coloration, 30-60 will start to have light straw to yellowing, the more oxygen inside the pipe the more coloration/oxide thickness/oxidization of the metal.