Elbow, 90 degree elbow, 90 degree elbow manufacturer 90 degree elbow Profile: 90 degree elbow angle elbow materials are cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, non-ferrous metals and plastics welding and tube links (the most common) flanged, threaded coupling and socket coupling. the elbow symbol: schxx is the wall thickness level, 90e (s) for short radius 90 degree elbow; 90e (l) long radius 90 degree elbow; 45e (l) long radius 45 degree elbow, 45e (s) for short radius 45 degree elbow 180e (s) for short radius 180 degree elbow; 180e ( l) long 180-degree radius elbow; r (c) Concentric Reducer, r (e) indicates that the eccentric reducer fittings, Tee t (s), t (r) Reducing Tee, Cr (s) Equal Stone, cr (r) Reducing Cross, c cap, concrete can look at the problem of the GB/T12459-2005 steel welded seamless pipe fittings 90 degree elbow expand the commencement of sheet metal pattern are generally intersecting line method lofting formula drawing software draw more convenient. gnarled elbow called "shrimp waist hand lofting steps: (a, for example, and the rest the same way) ) press the actual size of the draw elbow projected lateral seam line. 2) by line a closed wireframe graphics split into separate graphics (can be cut, but also can be used alone and then draw. 3) Take a pattern, (perpendicular to the centerline of the set) drawn on a separate sheet of paper, along the pattern height Two lines are drawn parallel to the upper and lower horizontal line perpendicular to the centerline, the length is just the circumference of the pattern diameter (closed rectangle)) the the pattern vertical direction for equal portions, and tagged, then perpendicular bisector painting to just painting expanded rectangular, pay attention to expand on point must correspond to a point on the projection pattern. 5) pattern on slash along the horizontal direction for equal portions and pulled parallel to the start of the pattern, and corresponds to the corresponding point to expand like the intersection of sleek, is to expand the curve. divided into more dense, more curves quasi-6) release the amount of seams, and the thickness processing