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.
Lettuce, except iceberg, is also a moderately good source of vitamin C, calcium, iron and copper. Look for salad greens that are darker green in color. Iceberg lettuce has little nutritional value. One cup of raw leaf lettuce has 9 calories, 1 gram of protein, and 1.3 grams of fiber.