Hold your horse McSimon;

It is clear this shear didn't fail in one day, so the customer can wait a day or two for you to get your ducks in a row and plan this repair. First you need to know what type of base metal you are dealing with. A small piece of it should be sent to a lab for chemical analysis. Then you know what you are dealing with.

Now you can determine the appropriate preheat based on chemistry and the thickness of the material being welded. You can also determine what electrode is most appropriate. The shear could be fabricated from a low alloy high strength steel or it could be plain carbon steel. That should influence your choice of filler metal.

Simply gouging out the crack and rewelding it can cause irrepairable damage to the alignment of the moving parts. You have to consider all the parts involved and how they interact.

Photos will help us help you. Take photos, plenty of them, and a few dimensions. Attach them to the message as pdf files. That will condense the size of the files and make it easier to transmit. When you write your message, send it and then look along the bottom edge. You'll see a notation "attach". Hit the button and it will take you to a different menu. Follow the instruction and you should be ship shape.

A rushed repair that doesn't hold up will lead to an unhappy client that will be more than happy to spread the word you are a terrible welder. Sometimes a "Golden Arm" isn't enough. The brain must be engaged before the first arc is struck.

Al