Development of process of buffer tank chamber assembly-welding

Contents

INTRODUCTION

MAJOR PART

1. Process Section

1.1. Feasibility Study for Welding Method Selection

1.1.1. Analysis of welded article

1.1.2. Manual arc welding with coated electrodes

1.1.3. Carbon Dioxide Welding

1.1.4. Welding in mixtures of argon with oxygen, argon with carbon dioxide and argon with carbon dioxide and oxygen

1.1.5. Automatic flux welding 

1.1.6. Selecting a Welding Method

1.1.7. Selecting Welding Materials

1.1.8. Selection of welding equipment

1.1.9. Select Welding Assembly Tooling

1.1.10 Arrangement of unit for article welding

1.2. Development of assembly-welding processes

1.2.1. Calculation of welding modes

1.2.2. Assembly-Welding Processes

1.3. Development of control technology

1.3.1. Weld Defects Analysis

1.3.2. Analysis and selection of control methods and equipment

2. DESIGN SECTION

2.1 Calculation of technical time standards for fabrication of the structure

2.2 Calculation and Design of the Rotator

2.3 Development of assembly and welding shop plan

3. ORGANIZATIONAL AND ECONOMIC DIVISION

4. SAFETY OF PROCESS OF ASSEMBLY-WELDING OF ARTICLE

CONCLUSION

BIBLIOGRAPHIC LIST

Introduction

Creating a welded structure is a complex task, which includes designing, studying strength, calculating, rational choice of manufacturing technology, primarily welding, using mechanization and automation tools.

Welded joints have the property of gas and waterproof, which is important for sheet structures intended for the storage of gases or liquids (tanks, gas tanks, pipelines).

Shell-type structures are assembled from sheet blanks and welded with tight seams. Depending on overall dimensions, design and peculiarities of manufacture and operation, shell structures can be divided into oversized tanks and structures, pressure vessels, pipes and pipelines. Shell structures that tend to be overpressure; they are required to be sealed; this type includes various vessels, vessels and pipelines.

Pressure receptacles are suitably divided into the following groups: thin-sheet, medium-thick, thick-walled and multi-layered. Thin-walled vessels are typically shaped like a cylinder, sphere, or torus. The choice of form may be determined by various considerations. The spherical vessel at a given capacity has a minimum mass, which can be compactly placed, for example, around the combustion chamber, the cylindrical shape of the vessel provides the most technological design. Joints are made by longitudinal, circular and circular sutures. Thin-walled vessels are usually structural elements of various transport installations. In cases where mass savings are not required, well-welded materials of low strength are used.

Buffer tanks are used in oil transportation enterprises (oil depots, oil pumping stations, etc.). Tanks are used to extract coarsely dispersed impurities from waste water. They are also called "oil tanks" or "oil tanks." Depending on the waste water treatment process, storage tanks, pit tanks or buffer tanks may be used.

Buffer tanks for petroleum products (settling tanks) are most often equipped with water distributing and oil collecting devices that allow even hard-to-separate oil to float to the surface of the water. Such containers for petroleum products are usually needed in large quantities at the plant. The buffer tanks must clearly perform the cleaning scheme, so a minimum of three are required. The water settles for about 624 hours. First, the surfaced oil is removed, then the precipitated precipitate: the tanks are equipped with a drain from perforated pipes. After that clarified water is pumped out of oil treatment tank. Standard steel oil treatment tanks (sumps) are the most reliable and easy to operate.

For automatic arc welding under flux, uncovered electrode wire and flux are used to protect arc and welding bath from air. The supply and movement of electrode wire, as well as the processes of ignition of the arc and brewing of the crater at the end of the seam are automated. Flux welding is characterized by deep penetration of the base metal. Automatic welding is widely used in the manufacture of boilers, tanks for the storage of liquids and gases, hulls of ships, bridge beams and other products. It is one of the main links of automatic lines for the manufacture of welded car wheels and mills for the production of welded straight seam and spiral pipes.

When welding in a protective gas, the electrode, arc zone and welding bath are protected by a jet of protective gas. Inert gases (argon and helium) and active gases (carbon dioxide, nitrogen, hydrogen, etc.), and sometimes mixtures of two gases or more, are used as protective gases. The fields of application of welding in protective gases cover a wide range of materials and products (aircraft assemblies, elements of nuclear plants, hulls and pipelines of chemical devices, etc.).

As a result of the diploma project, the process of assembly-welding of the buffer vessel chamber was developed with calculation of welding modes and selection of technological equipment.

Organizational and Economic Division

3.1. Business Case for Alternative Welding Methods

The economic evaluation of the effectiveness of the new technology is based on a comparative analysis of two options for obtaining parts: the first is the basic option, in which mainly mechanized welding was used in the environment of protective gases, the second is the developed technical process of exhaust qualification work, in which automatic welding in the environment of protective gases is introduced.

The process cost of a unit of production includes costs per unit for those items that change when you switch to a new production technology. In general, cost items include variables and fixed costs.

Variable costs include the costs of basic materials, auxiliary materials, energy for technological purposes, the wages of the main production workers with all surcharges and deductions for social insurance, the costs of maintaining and operating equipment, wear and tear of tools and devices.

Fixed costs include depreciation and maintenance of equipment, wear and tear of special technological equipment, costs for maintenance of production area, costs for maintenance and operation of process equipment, other workshop expenses.

The production cost of the product is the cost estimate of the total cost of the enterprise for the production of products, and is determined by an accurate method based on the standards of the materials used and labor costs.