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.
How to Keep Iceberg Lettuce From Getting Brown. Iceberg lettuce provides crunch to burgers and sandwiches. It's also suitable for salad when combined with other lettuce varieties and vegetables. The lettuce leaves begin browning soon after harvest or purchase if not stored properly. Browning occurs from spoilage. Reddish-brown discolorations, called rust, occur when there is too much moisture on the lettuce head. Managing the moisture level during storage prevents both spoilage and rust. Coring the lettuce helps prevent browning.