A few of you studying this are about to take your first TIG welding certification take a look at within the aerospace business. Possibly you’re transitioning from one other business like pipe welding the place you welded stainless and carbon metal pipe, or meals service the place you welded stainless-steel sheet metallic. Both approach, let me inform you a number of suggestions that may enable you to prepare:
Every little thing is thinner and smaller. The tig torch, electrode, filler wire, and presumably even the tig welding machine can be smaller than you’re accustomed to. In pipe welding for instance, a 1/8 inch rod is taken into account the massive tig welding rod. In Aerospace tig welding, a 1/16 inch rod is huge.
Every little thing must be cleaned higher. All joints are usually x-rayed in an aerospace tig welding certification take a look at. Metals like titanium, aluminum, and magnesium are susceptible to porosity. Keep in mind the three C’s …clear, clear, clear. Particularly vital is submitting the sheared fringe of metallic that can be welded. That sheared edge seems fairly clear however it’s a lure for oil and corrosion merchandise. File it and if you suppose you’ve gotten filed it sufficient, file some extra.
Every little thing makes a distinction. Little issues like the scale of your tack welds, the way you place the take a look at plates within the fixture, how a lot circulate charge is used on the purge fuel, angle of torch, angle of filler metallic rod, what sort of abrasive you utilize to wash the metallic, how pure the argon or different shielding fuel is…you get the image. Like my outdated coach used to inform me…nothing is honest, however the whole lot issues.
Every little thing must be shielded higher. The recent tip of the filler rod will put oxides in your puddle. You will get away with slightly of that in pipe welding stainless and gentle metal, however it can kill you when welding one thing like .020″ 15-7 precipitation hardening stainless or .032″ inconel 718. To maintain the top of the rod completely shielded , use a tig cup that’s at the very least 3/4 inch id. With a diffuser that offers a pleasant comfortable blanket of argon shielding to the puddle. ..and you could take a look at it on a scrap piece of titanium to verify it’s working earlier than lighting up in your tig welding certification plates.
3 extra suggestions for passing an aerospace tig welding take a look at…
- About 1 amp per 1 hundreds of thickness welded will get you within the ball park. Set the tig welding machine amperage accordingly plus about 10 extra amps simply in case and use the foot pedal to regulate. This can preserve you out of hassle by limiting your amperage. often a bead width of 4 instances the thickness welded will get the penetration wanted for butt welds.
- Use the smallest electrode that can get the job performed. And sharpen it actually good with scratches operating lengthwise. lengthy tapered works higher for actually skinny (.020″) and fewer of a taper is best for thicker welds
- Use the smallest filler wire that can work with having to feed an excessive amount of. Too huge a tig welding rod will draw an excessive amount of warmth out of the puddle and can trigger you to make use of extra amperage than is required . Too small a filler wire will trigger you to feed an excessive amount of and also you cant sustain.