7018 is a DC+ or AC rod. This is common knowledge for people in the welding trade. Farmers or people who weld for a hobby may not know this. 7014 is stronger than 6013 but not just because it has a higher tensile strength. Tensile strength is only one factor of many in determining weld strength. 6010(DC) or 6011(AC) are actually stronger than 7014. They are designed for dynamic loading, where 7014 is designed for static loading. 6013 is considered more the "farmer rod" than 6011 because it is easier to strike an arc and weld with for beginners. Something to consider is that pipelines when welded by hand, are often done with 6010. 7014 and especially 6013 are never specified for more important welds that may be under stress(dynamic loading). I've discussed static and dynamic loading before and most people have never heard of these terms used when relating to welding. I think I have come up with an easier way to explain it. The terms are used in aircraft. When a plane is flying, the wing is moving up and down and is under stress. This is dynamic loading. 747 wings are tested to the extremes of dynamic loading, to make sure the plane is safe under the harshest conditions possible. If the plane was sitting in a hanger, the wings would only be under their own weight (static loading). I have often heard the term static display model used for aircraft that is only on display and not flown. I hope this makes it easier to understand. It's good to want to give advice, just make sure to give the right advice. People can be hurt or get really frustrated from using the wrong and/or bad advice. I'm not trying to disrepect you Mr. Weldor. I am a little curious about how much experience you have in the welding industry. You don't seem sure of some of your responses. A little background would help to back up your advice. This is good site with lots of very knowledgable people on almost any subject that comes up. Dave
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