There are settings for both gas pressure and flow rate. These can vary depending upon the welding position, metal type/thickness, type of gas used, and conditions (wind, drafts etc.) My welding instructor told us that 20-20 is a good place to start (20 psi, 20cfm flow).
It is the one lettuce that doesn't have a lot of Vitamin K. One cup of iceberg lettuce contains only about 13 micrograms (mcg) of Vitamin K. This is a low amount and should be safe for you to use as part of your diet while on CoumadinÂ® (warfarin). Thanks for writing, Timothy S. Harlan, MD, FACP. Dr. Gourmet.
Additionally, you would have to eat 0.78 leaf outer of romaine lettuce (cos lettuce, raw) to get 25% (22.5mcg) of your recommended daily Vitamin K. Here are some examples of foods that compare with romaine lettuce (cos lettuce, raw). To view more foods in other food categories, visit the Vitamin K Food Database.