AboutEd Kerr Expertise I can answer questions about TIG,MIG and Stick welding, Oxy fuel and Plasma cutting. The affects welding and heat have on certain metals. Materials you can and cannot weld. What to do and not to do on pressure vessel and pipe repairs.
Experience 22 years Aviation and aerospace tooling and equipment fabrication, welding and repair. Aircraft airframe welding and repair. Welding exotic metals and alloys.Marine Aluminum and Stainless steel welding and fabrication. General welding and fabrication.
Education/Credentials H.S diploma
Awards and Honors American Welding Society Welding code certifications
Military Spec welding procedures and qualifications
Question Any pointers on arc and tig welding in the 4g open butt 6010, 7018 hot, fill and cap. And 4g open butt tig root, 7018 hot, fill and cap. And 4g tig all the way out. Thank you! Great tips on the 2g! Helped me pass a bend test.
Answer Hi, It depends if you are prepping the coupon and have any say on the size of your root landing, I think the standard is 1/8" my preference is practically a knife edge with a 1/16" root opening for Arc. When I weld overhead I keep the rod perpendicular to the joint, with open butt speed and heat setting are the key, a trick I use to keep the keyhole for the root pass is if I see the hole opening up, a slight whip with forward angle on your rod can help get you back on track, at the same time, welding over a cold tack can be helped by slightly dragging the rod to get a little more penetration. I weld the hot pass hot and fast, of course cool it down for your fill passes. I like to leave the filler just under flush at the top of the joint, it leaves you with more options during the cap pass and lets you see the joint width better. For tigging the root, I like a 1/8" root gap and landing. I leave the wire when I TIG weld which means I don't dip it (except for aluminum) I feel like I have more heat control by manipulating the pedal. If your using a micro switch, cool down your setting a little, no matter what wire feed technique you use(leave or dip). See if this works for you. Glad I could help.
