Ok, This is kinda hard to follow. First read ASME Section IX 405.3. There is a term called a "wash pass" which can be run up or down. What this means is you can DH a joint then run a 7018 DH to "slick er up". It can also be used on UH welds as well. Finding someone who can run LH downhill and make it look good is one mean trick these days. Before hand grinders were common the only way to dress up a weld was using welding rods.
In the tank business, years ago, you got paid on production and inches of weld. Slicking the weld off was a way to clean up the weld quickly. Let me explain how this works as I have seen it done only twice. The 7018 is run HOT As you are weaving side to side the slag starts getting ahead of you. You take another welding rod and flick the molten slag away from the weld. Again while you are running the rod. A 8 foot joint will take 3-4 5/23 rods to do. Some of these welds are 3/4 to 1 inch wide!.
Your crew is bing asked to do something that is no longer done in the industry. There are still a few people in the business who can do this. Also regardless of the welding progression, this "wash pass" not change the essential variable of the welder test????? You are limited on DH welds in 650/653 to materials 1/2 inch and less. If your guys are welding out 7018 and need to sleck er up, you need new welders!
BABRT's