METALLIC STRUCTURE 2

The length of rivet to be chosen when making a structural repair that involves the joining of 0.032-inch and 0.064-inch aluminum sheet, drilled with a No. 30 drill, is. 7/16 inch. 5/16 inch. 1/4 inch.

Welding over brazed or soldered joints is. not permitted. permissible for mild steel. permissible for most metals or alloys that are not heat treated.

When bending metal, the material on the outside of the curve stretches while the material on the inside of the curve compresses. That part of the material which is not affected by either stress is the. mold line. bend tangent line. neutral line.

When welding or cutting, the acetylene pressure gauge should never be set higher than. 15 psi. 20 psi. 25 psi.

The general rule for finding the proper rivet diameter is. three times the thickness of the materials to be joined. two times the rivet length. three times the thickness of the thickest sheet.

Why are aluminum plates 1/4 inch or more thick usually preheated before welding?. Reduces internal stresses and assures more complete penetration. Reduces welding time. Prevents corrosion and ensures proper distribution of flux.

Which of the following statements is true regarding replacement rivets?. Rivets may never be replaced with a type having lower strength properties. The new edge distance of larger replacement rivet must not be less than minimums. Rivet spacing for larger replacement rivets is regarded as a design parameter of the manufacturer and does not need to be considered.

What method of repair is recommended for a steel tube longeron dented at a cluster?. Welded split sleeve. Welded outer sleeve. Welded patch plate.

Rivet pitch is the distance between the. centers of rivets in adjacent rows. centers of adjacent rivets in the same row. centers of adjacent rivets in the same row.

The shop head of a rivet should be. one and one-half times the diameter of the rivet shank. one-half times the diameter of the rivet shank. one and one-half times the diameter of the manufactured head of the rivet.

What is one of the determining factors which permits machine countersinking when flush riveting?. Thickness of the material and rivet diameter are the same. Thickness of the material is less than the thickness of the rivet head. Thickness of the material is greater than the thickness of the rivet head.

A well-designed rivet joint will subject the rivets to. compressive loads. shear loads. tension loads.

Annealing of aluminum. increases the tensile strength. makes the material brittle. removes stresses caused by forming.

If it is necessary to compute a bend allowance problem and bend allowance tables are not available, the neutral axis of the bend can be. represented by the actual length of the required material for the bend. found by adding approximately one-half of the stock thickness to the bend radius. found by subtracting the stock thickness from the bend radius.

Unless otherwise specified, the radius of a bend is the. inside radius of the metal being formed. inside radius plus one-half the thickness of the metal being formed. radius of the neutral axis plus one-half the thickness of the metal being formed.

Edge notching is generally recommended in butt welding above a certain thickness of aluminum because it. helps hold the metal in alignment during welding. aids in the removal or penetration of oxides on the metal surface. aids in getting full penetration of the metal and prevents local distortion.

Which part of 2017-T36 aluminum alloy indicates the temper designation?. T36. 2. 17.

Oxygen and acetylene cylinders are made of. seamless aluminum. steel. bronze.

How should a welding torch flame be adjusted to weld stainless steel?. Slightly carburizing. Slightly oxidizing. Neutral.

If too much acetylene is used in the welding of stainless steel,. a porous weld will result. the metal will absorb carbon and lose its resistance to corrosion. oxide will be formed on the base metal close to the weld.

Which statement is true in regard to welding heat-treated magnesium?. The welded section does not have the strength of the original metal. Flux should not be used because it is very difficult to remove and is likely to cause corrosion. Magnesium cannot be repaired by fusion welding because of the high probability of igniting the metal.

(Refer to Figure 4.) The length of flat A is. 3.750 inches. 3.875 inches. 3.937 inches.

Which statement concerning soldering is correct?. Joints in electric wire to be soldered should be mechanically secure prior to soldering. Changeable shades of blue can be observed on the surface of a copper soldering tip when the proper temperature for soldering has been reached. If the soldering temperature is too high, the solder will form in lumps and not produce a positive bond.

A rivet set used to drive MS20470 rivets should. have the same radius as the rivet head. have a slightly greater radius than the rivet head. be nearly flat on the end, with a slight radius on the edge to prevent damage to the sheet being riveted.

What precaution, if any, should be taken to prevent corrosion inside a repaired metal honeycomb structure?. Prime the repair with a corrosion inhibitor and seal from the atmosphere. Paint the outside area with several coats of exterior paint. None. Honeycomb is usually made from a man-made or fibrous material which is not susceptible to corrosion.

Heat-treated rivets in the D and DD series that are not driven within the prescribed time after heat treatment or removal from refrigeration. must be reheat treated before use. must be discarded. may be returned to refrigeration and used later without reheat treatment.

The markings on the head of a Dzus fastener identify the. body diameter, type of head, and length of the fastener. body type, head diameter, and type of material. manufacturer and type of material.

Which rivet may be used as received without further treatment?. 2024-T4. 2117-T3. 2017-T3.

When an MS20470D rivet is installed, its full shear strength is obtained. only after a period of age hardening. by the cold working of the rivet metal in forming a shop head. by heat treating just prior to being driven.

Where should the flux be applied when oxyacetylene welding aluminum?. Painted only on the surface to be welded. Painted on the surface to be welded and applied to the welding rod. Applied only to the welding rod.