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A few of you studying this are about to take your first TIG welding certification take a look at within the aerospace trade. Perhaps you’re transitioning from one other trade like pipe welding the place you welded stainless and carbon metal pipe, or meals service the place you welded stainless-steel sheet metallic. Both means, let me let you know a couple of suggestions that may assist you prepare:
All the things is thinner and smaller. The tig torch, electrode, filler wire, and probably 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 large.
All the things 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 liable to porosity. Keep in mind the three C’s …clear, clear, clear. Particularly essential is submitting the sheared fringe of metallic that can be welded. That sheared edge appears fairly clear however it’s a lure for oil and corrosion merchandise. File it and while you suppose you’ve got filed it sufficient, file some extra.
All the things 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 circulation fee is used on the purge gasoline, angle of torch, angle of filler metallic rod, what sort of abrasive you employ to scrub the metallic, how pure the argon or different shielding gasoline is…you get the image. Like my outdated coach used to inform me…nothing is honest, however all the things issues.
All the things must be shielded higher. The new tip of the filler rod will put oxides in your puddle. You may get away with a bit of of that in pipe welding stainless and delicate metal, however it should 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 mushy blanket of argon shielding to the puddle. ..and it’s worthwhile to 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 1000’s 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. It will hold you out of bother by limiting your amperage. normally a bead width of 4 instances the thickness welded will get the penetration wanted for butt welds.
- Use the smallest electrode that may get the job executed. 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 may work with having to feed an excessive amount of. Too large 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.
