偉民 (andr00) wrote,
偉民
andr00

Approximately 3,000 degrees Fahrenheit

I didn't think welding would be so funny. Maybe it's only funny to me. There are 8 people in my class, and we were all standing around with oxyacetylene torches on Monday, learning how to ignite them. The first step is to turn on the acetylene and light it. Acetylene, when burning slowly, lets off little floating balls of carbon, dark black, which are buoyed by the heat. We had the room ventilators switched off so that we could hear the instructions, so these little balls accumulated in the spacious volume of the welding shop, until it was absolutely filled with little floating black dots. It was like a demo effect. I could not stop grinning at it.

On top of that, we're all supposed to be wearing long sleeved natural fibers, to protect our arms from high temperature sparks and burns from the UV rays that arc welding emits. Everyone else was in light summery colors. Of course, I'm wearing a black turtleneck. (I have years of experience wearing this kind of thing in Hawaiian weather.) Eventually all those little black dots start coming back down and landing on absolutely everything. They're carbon, so they smudge into little grey smears all over everyone's clothing. We all look filthy! Except me, because I'm wearing black. Ha ha!

My first project is a little cube. I have already cut out all its faces on the powerful but somewhat imprecise hydraulic shear in the metal shop. Its geometry is going to be... a little wonky. Arty, I'll say.
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