cutting at joint and is their a union to splice into 1" steel pipe after i cut it

To properly cut and re-thread steel pipe you need a pipe cutter, pipe threader, and pipe deburrer…none of which are cheap. If you know how long a piece you need, have the supply house or home center cut and thread the piece(s) for you. I think Lowes does this for little or no extra cost. If you have a lot of threading to do, try renting the cutter, threader, and de-burrer, plus a pipe vise. [You will also need cutting oil for the threading process.] You then use couplings, not unions, to rejoin the pieces. [Unions are used to join two pipes when you cannot turn one of the pipes because it is already in place.] Use standard forged couplings, not the cheap smooth "merchant" couplings which often come with pipe lengths. Be sure to use high quality "pipe dope" to join the pipe/fittings. It comes in tape or brush on types, depending on your preference, the type of pipe, and what the pipe will carry [water, gas, etc.]

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