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.
Green leaf lettuce also delivers 10 percent of the recommended daily intake of vitamin C, which is twice the amount in romaine or butterhead lettuce. Iceberg has 3 to 7 percent fewer B vitamins.ceberg only has half the amount of iron. The same serving size of green leaf, romaine or butterhead lettuce provides 3 to 5 percent of the recommended daily intake of calcium, magnesium, phosphorus and potassium.