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.
1 1.7 grams of carbohydrate in 1 cup of shredded/chopped iceberg lettuce. 2  3 grams of carbohydrate in 3.5 ounces, or 100g, of iceberg lettuce. 3  16-17 carbohydrates in 1 medium head of iceberg (6 inches diameter). 4  1 gram of carbohydrate in 1 ounce, or 28g, of soft green leaf lettuce types.