Welded cylinders

A mallet is composed of a section of a right circular cylinder welded to a cylindrical shaft, as shown in Figure 2-4a and b. Both components are steel, and the density is uniform throughout. Find the centroid of the mallet. 

This paper deals with the control of weld depth penetration for cylinders in gold-nickel alloy and tantalum. After introducing the experimental set-up and the samples description, the study and the optimization of the testing are presented for single-sided measurements either in a pulse-echo configuration or when the pump and the probe laser beams are shifted (influence of a thermal phenomenon), and for different kind of laser impact (a line or a circular spot). First, the ultrasonic system is used to detect and to size a flat bottom hole in an aluminium plate. Indeed, when the width of the hole is reduced, its shape is nearly similar to the one of a slot. Then, the optimization is accomplished for... 

Fig. 2 Description of the weld depths penetration for gold-nickel alloy and tantalum cylinders.

The weld depths penetration for gold-nickel alloy and tantalum cylinders have been well controlled by an entirely contactless ultrasound method. Nevertheless, the development of signal and image processing will allow to increase the resolution of the ultrasonic images. Moreover, in order to be able to size quite well the lacks of weld penetration, the simulation of the interaction beam-defect is presently developed in our laboratory. 

The specifications set the maximum vol % of solvent that may be added to the cylinder shell (measured by its water capacity). The volume of solvent also varies with the capacity of the cylinder. Cylinders in the 90—92% porosity range with a capacity above 9.1 kg of water may contain a maximum acetone charge of 43.4%, whereas those with 9.1 kg or less water capacity may contain up to 41.8 vol %. The first category of cylinders are normally referred to as welding cylinders and the latter as small tanks (those with 0.28 and 1.12 m acetylene capacity). 

The largest use for calcium carbide is in the production of acetylene for oxyacetylene welding and cutting. Companies producing compressed acetylene gas are located neat user plants to minimize freight costs on the gas cylinders. Some acetylene from carbide continues to compete with acetylene from petrochemical sources on a small scale. In Canada and other countries the production of calcium cyanamide from calcium carbide continues. More recentiy calcium carbide has found increased use as a desulfurizing reagent of blast-furnace metal for the production of steel and low sulfur nodular cast iron. 

Welded pipe is made from rolled strips formed into cylinders and seam-welded by various methods. The welds are credited with 60 to 100 percent of the strength of the pipe wall depending on welding and inspec tion procedures. Larger diameters and lower ratios of wall thickness to diameter can be obtained in welded pipe than can be... 

In such cases basket anodes are frequently used. These have a relatively large surface and work at a low driving voltage due to their special construction. A cylinder of platinized titanium-expanded metal serves as the basket to which a titanium rod is welded. This serves as the current lead and carrier, and ends in a plastic foot that contains the cable lead and at the same time serves as the mounting plate. The expanded metal anode exhibits a very uniform anode current density distribution, even at large dimensions, in contrast to the plate anode. The reason is the many comers and edges of the metal that make the point effect only evident at the outer edges of the anode. 

Provide permanent brazed or welded pipelines from the cylinders to near the points of gas use. Select pipe materials suitable for the gas and its application. Any flexible piping used should be protected against physical damage. Never use rubber or plastic connections from cylinders containing toxic gases. 

Round-welded or seamless pipe for use as foundation piles where pipe cylinder acts as a permanent load-carrying member usually filled with concrete. Used below the ground in foundation work in the construction industry for piers, docks, highways, bridges and all types of buildings. Fabricated to ASTM piling specifications (ASTM A-252). 

The drum length for multiple cylinder units will be determined by the center-to-center distances of the outer-most cylinders plus a minimum length for the installation of the flanges to connect to the cylinders and the mechanical clearances for good welding and fabrication. 

Both the refillable and non-refillable cylinders must, of course, be designed for the internal pressure conditions likely to be experienced during their lifetime. Welded steel cylinders are designed based upon a maximum liquid temperature of 55°C and the associated vapor pressure... 

Ensure that empty cylinders have the valve closed to prevent evaporation of acetone. Close cylinder valve before shutting off regulator, to permit gas to bleed from regulator. When used e.g. for welding, avoid the careless use of flame which could fuse the metal safety plug in the cylinder. 

When used e.g. for welding, avoid the careless use of flame which could fuse the metal safety plug in the cylinder. 

Process vessels are built up from preformed parts cylinders, heads, and fittings, joined by fusion welding. Riveted construction was used extensively in the past (prior to the 1940s) but is now rarely seen. 

Gas cylinder. A welded or forged vessel usually with a ratio of length to diameter from 5 1 to 50 1, usually with hemispherical or other specially designed heads. 

Troyan13 suggests that all pumps, compressors, turbines, and other equipment should be checked internally before they are turned on. He notes that such an inspection of a large gas compressor revealed rust and scale from nearby pipes, a welding rod, and a small pipe wrench within the cylinder itself. Starting up the compressor before these items were removed could have done enough damage that whole sections would need replacement. This could have delayed the startup for weeks or even months. 

---