Posted by Andy Martin on January 10, 2016 at 17:34:07 from (209.213.149.120):
In Reply to: DC Welding posted by David G on January 10, 2016 at 16:23:09:
6010 and 6011 are equivalent welding rod, 6010 is intended for DC and 6011 for AC. The 60 in each refers to 60,000 psi tensile strength for the weld metal.
7018 is low hydrogen rod, intended for welding high alloy steels while avoiding weld cracking due to dissolved hydrogen in the liquid weld metal. That hydrogen can collect and crack the weld upon cooling. Since some farm machinery can include high strength steel, the 7018 is a good rod and can be useful. 70 refers to 70,000 psi tensile strength of the weld metal.
7018 must be kept dry for it to provide low hydrogen properties. That means using fresh out of the sealed box, or keeping it in a temperature controlled rod heater. Old refrigerator with a light bulb inside is a poor alternative but better than no protective storage at all.
7018 not stored properly is as good as 6011 but without the low hydrogen properties. 7019 is not good for just any alloy.
The best rod for welding unknown high strength materials is a stainless steel rod, E309. E308 is a poor substitute but still good for lots of dissimilar metal welds. It is worth keeping a little E309 around for things like a high strength axle or forging repair on equipment less than 40 years old. Alloy steels are much stronger than plain steel but cost only a little more, so have been used by manufacturers for many years to save money. Repairs may be wise with a good welding rod.
Old spring steel can be easily welded with 6011 without failure so long as it is preheated to 400 degrees or so immediately prior to welding, and kept from cooling quickly after welding. I've done lots of successful Farmall drawbar repairs with 6011 this way.
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