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AC 43.13-1B CHG 1 sizes, proven satisfactory by experience, are 9/27/01 4-84. ROSETTE WELDS are generally employed to fuse an inner reinforcing tube (liner) with the outer member. Where a rosette weld is used, drill a hole, (in the outside tube only) of sufficient size to insure fusion of the inner tube. A hole diameter of approximately one-fourth the tube diameter of the outer tube serves adequately for this purpose. In cases of tight-fitting sleeves or inner liners, the rosettes may be omitted. Rosette weld edge distance is 1/2 the diameter of the tube, as measured from the edge of the rosette hole to the end of the inside and outside tube. Rosettes shall not be considered when determining the strength of a welded form. Drill an 1/8-inch hole in the lower tube in the center of the intended rosette weld so the heat does not burn away the outer tube. This small hole tends to bleed off the heat from the torch and keeps the size of the rosette small. 4-85. HEAT-TREATED MEMBERS Certain structural parts may be heat treated and, therefore, could require special handling. In general, the more responsive an alloy steel is to heat treatment, the less suitable it is for welding because of its tendency to become brittle and lose its ductility in the welded area. Weld the members which depend on heat treatment for their original physical properties by using a welding rod suitable for producing heat-treated values comparable to those of the original members. (See paragraph 4-74.) Af ter welding, heat treat the affected members to the manufacturer’s specifications. 4-86. TYPES OF WELDING. a. Gas Welding. A fuel gas such as acety lene or hydrogen is mixed inside a welding torch with oxygen to produce a flame with a temperature of around 6,300 °F (3,482 oC). Par 4-75 shown in table 4-13. TABLE 4-13. Torch tip sizes. Thickness of steel (in inches) Diameter of hole in tip Drill size 0.015 to 0.031 0.031 to 0.065 0.065 to 0.125 0.125 to 0.188 0.188 to 0.250 0.250 to 0.375 0.026 .031 .037 .042 .055 .067 71 68 63 58 54 51 4-83. WELDING RODS AND ELEC TRODES Use welding rods and electrodes that are compatible with the materials to be welded. Welding rods and electrodes for vari ous applications have special properties suit able for the application intended. Lap welds are used in shear applications. The weld throat of the fillet weld is considered the plane 45 degrees to the surface plane of the sheet being welded and is equal to 0.707 times the thickness of the sheet stock. (See fig ure 4-27.) 0.707xtx1xFwsu the allowable tensile strength of the joint. the thickness of the sheet stock (the throat of the weld joint. the length of the weld joint. the shear strength of the filled rod material. PWS = where: PWS = t= l= Fwsu = FIGURE 4-27. Lap Weld Strength Calculation Page 4-56PDF Image | AFS-640
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