Figure 4-30. - Using a cutting torch to remove a rivet head,
By the time the slot has been cut, the rest of the rivet rope strands from unlaying during cutting, seize the wire head is at cutting temperature. Just before you get through the slot, draw the torch tip back 1 1/2 inches to allow the cutting oxygen to scatter slightly. This keeps the torch from breaking through the layer of scale that is always present between the rivet head and the plate. It allows you to cut the head of the rivet off without damaging the surface of the plate. If you do not draw the tip away, you could cut through the scale and into the plate.
A low-velocity cutting tip is best for cutting button- head rivets and for removing countersunk rivets. A low-velocity cutting tip has a cutting oxygen orifice with a large diameter. Above this orifice are three preheating orifices. Always place a low-velocity cutting tip in the torch so the heating orifices are above the cutting orifice when the torch is held in the rivet cutting position.
You can use a cutting torch to cut wire rope. Wire rope consists of many strands, and since these strands do not form one solid piece of metal, you could experience difficulty in making the cut. To prevent the wire rope on each side of the place where you intend to cut.
Adjust the torch to a neutral flame and make the cut between the seizings. If the wire rope is going to go through sheaves, then you should fuse the strand wires together and point the end. This makes reeving the block much easier, particularly when you are working with a large-diameter wire rope and when reeving blocks that are close together. To fuse and point wire rope, adjust the torch to a neutral flame; then close the oxygen valve until you get a carburizing flame. With proper torch manipulation, fuse the wires together and point the wire rope at the same time.
Wire rope is lubricated during fabrication and is lubricated routinely during its service life. Ensure that all excess lubricant is wiped off the wire rope before you begin to cut it with the oxygas torch.
Never perform cutting or welding on containers that have held a flammable substance until they have been cleaned thoroughly and safeguarded. Cutting, welding, or other work involving heat or sparks on used barrels,Continue Reading