Discovering Brazing (Braze Welding)
Brazing is a gas welding procedure inward which you lot bring together metals past times using oestrus that surpasses the 800 grade Fahrenheit grade as well as a nonferrous (iron-free) filler rod alongside a melting temperature below that of the base of operations materials. The most important indicate most brazing is that you lot tin role it to bring together dissimilar metals — shape Fe to steel, brass to steel, or copper to steel, only to refer a few examples.
Keeping a few brazing rules inward mind
A successful brazing chore requires that you lot stick to a few rules, every bit follows:
✓ The surfaces of the metals must endure gratuitous of contaminants. Use steel wool to build clean off all the metals, as well as role flux (a fabric that dissolves or removes oxides as well as other contaminants from the surface during brazing) for additional cleaning when the surfaces are heated.
✓ The articulation to endure brazed must convey a tight fit. You role ii basic joints for brazing: the butt articulation (two pieces of fabric lying together on the same plane) and the lap articulation (two pieces of fabric overlapping each other, commonly inward a parallel plane). If the articulation has sizeable gap, brazing just doesn’t work. But if the articulation is also tight, the melted filler rod can’t penetrate the entire joint, as well as you lot larn a weak, ineffective weld.
✓ The base of operations metals you’re brazing must rest stationary during the
heating as well as cooling process. If the base of operations metals movement piece you’re welding or before everything has cooled off afterwards welding, the joint’s integrity volition probable endure compromised
Giving brazing a try
If you’re trying brazing for the get-go time, I recommend going alongside an oxyacetylene torch inward the apartment set as well as using the forehand method I discuss inward “Making the weld” before inward the chapter. You tin start past times creating a brazed corncob, which is a slice created when you lot bring together ii different metals,
following the steps inward this section.
Brazing principles
1. Acquiring a department of carbon steel pipage i inch inward diameter as well as five inches long, every bit good every bit four 1⁄8-inch fluxed brazing filler rods that are 36 inches long.
2. Clean the pipage thoroughly alongside steel wool to take away whatever contaminants on the surface.
3. Lay the pipage betwixt ii sack bricks, leaving a 3⁄4-inch infinite between the bricks.
Fire bricks are particular bricks that tin withstand extremely high temperatures; uncovering them at your welding furnish or hardware store.
4. Set upwards as well as lite the oxyacetylene torch, using the steps I describe in “Working through the Basics of Welding alongside Gas” before inward this chapter, as well as suit the torch as well as then you lot convey a neutral flame.
5. Preheat the pipage to sack off whatever grease or varnish that may endure left on
the surface.
6. If you’re right-handed, start on the correct destination of the pipage as well as melt off a small part of the filler rod onto the destination of the pipe. If you’re left-handed, start on the left destination of the pipe. The molten puddle should endure rattling fluid. Be certain that when you lot role to a greater extent than of the filler rod, you permit exclusively the molten pool (not the flaming from the torch) melt the rod. If you lot notice white smoke coming from your molten puddle, that means you’re burning the zinc out of your filler rod, which volition final result inward a poor
weld. Avoid that work past times welding at a lower temperature or moving more chop-chop alongside the molten puddle. When you’re practicing the brazing process, you lot tin quench the metal between passes alongside the torch. Use pliers to choice upwards the department of pipe you’re practicing on as well as house it inward a tank of H2O to cool it very quickly. Quenching isn’t practiced for the integrity of the brazed weld, though, as well as then don’t quench unless you’re only practicing.
7. After you lot brand your get-go move past times alongside the torch, start a instant move past times by pointing the tip of the flaming at the border of the previous pass; when part of the get-go braze starts to melt, add together or as well as then of your filler rod and proceed. This move past times laps over the get-go braze bead 1⁄3 to 1⁄5.
8. When you’ve completed your instant pass, quench the welded metal (or allow it to cool) as well as larn ahead as well as start on a tertiary pass. When you’re finished alongside the tertiary pass, you lot should convey a finished
product that resembles the brazed corncob inward Figure 13-3. For some brazing projects, you lot may ask to brand fifty-fifty to a greater extent than passes. (For example, projects involving thick pieces of metallic definitely require to a greater extent than than three passes.)
product that resembles the brazed corncob inward Figure 13-3. For some brazing projects, you lot may ask to brand fifty-fifty to a greater extent than passes. (For example, projects involving thick pieces of metallic definitely require to a greater extent than than three passes.)
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- Advantages of TIG welding
- TIG welding Principles inward Easy language
- Welding Electrodes Explained
- MIG welding principles
- Aluminothermic or Thermit Welding Principles
- Submrged Arc Welding
- Flux shielded metallic arc welding procedure principles
- Resistance Projection Welding
- Resistance Spot Welding
- Resistance Seam Welding
- TIG Aluminum Welding Advantages made slow !
- Advanced TIG welding operations