I. Definition of occupation
Welding equipment and tools are used for welding, cutting and planing workpieces with welding materials.
Second, the scope of application
Manual arc welding, submerged arc welding, gas shielded welding, electroslag welding, plasma arc cutting, carbon arc gouging, casting welding repair, etc.
Third, the technical grade line
Elementary, intermediate and advanced
Junior welder
I. Knowledge requirements:
1. Name, model, specification, performance, structure, usage rules and maintenance methods of self-use equipment.
2. Names, specifications, uses, usage rules and maintenance methods of self-use instruments and meters.
3. Names, specifications, uses, rules of use and maintenance methods of individual workers, fixtures, measuring tools and protective appliances.
4. Types, brands, mechanical properties and weldability of commonly used metal materials. Basic knowledge of metal heat treatment.
5. Types, brands, specifications, scope of application, use and storage methods of covered electrode, welding wire, flux and tungsten electrode.
6. The influence of the nature and purity of common welding shielding gases (argon and carbon dioxide) on welding quality.
7. Basic knowledge of mechanical drawing, representation method and significance of weld symbols and groove forms.
8. Common sense of mathematical calculation.
9. Types, characteristics, scope of application and operation methods of common welding methods.
10. Application scope and connection mode of direct connection and reverse connection.
1 1. Basic concept of welding process parameters.
12. Common welding methods of carbon steel, low alloy steel, cast iron and non-ferrous metal materials, selection of welding materials and knowledge of welding process parameters.
13. Common welding joint forms, groove forms, groove angles, root gaps, blunt edges and their influences on welding deformation and welding quality.
14. Basic principles, tools, equipment, process parameters, operation methods and application scope of carbon arc gouging.
15. Welding technology of general weldments and repair methods of welding defects.
16. Types, causes, hazards and prevention methods of common welding and carbon arc gouging defects.
17. Basic knowledge of high altitude, narrow room or container operation.
18. Safety technical regulations.
Second, the skill requirements:
1. Use and maintenance of welding equipment and auxiliary equipment for personal use.
2. Use and maintain individual workers, fixtures, tires, measuring tools and protect, repair and replace electrode holders, gas shielded welding guns and gouging guns.
3. Use and storage of common instruments and gas cylinders.
4. Baking, use and storage of welding materials.
5. Understand the drawings of weldments and simple parts.
6. Select the welding and gouging process parameters and make preparations before welding.
7. When welding ordinary weldments of low carbon steel and low alloy steel, use carbon arc gouging to clean the welding roots.
8. Preheat and correctly measure the temperature of the welded parts.
9. Check the appearance quality of weld, identify the welding defects on the surface of weld, and measure the appearance dimensions of groove and weld.
10. Manual arc welding and gas shielded welding in plane and horizontal welding positions.
1 1.
12. It meets the requirements of post responsibility system and civilized production.
Third, the work example:
1. The butt weld of low-carbon steel plate with the thickness of10-14 mm shall be welded by manual arc welding at the flat and horizontal welding positions, requiring V-groove, one-sided welding and double-sided forming.
2. The butt weld of low-carbon steel plate with a thickness of 7- 12 mm shall be welded by manual TIG welding or CO2 gas shielded welding, and a V-groove is required.
3. Manual arc welding and gas shielded welding of fillet weld (leg size 6mm) at flat or horizontal welding position of low carbon steel plate, submerged arc welding and carbon dioxide gas shielded welding of fillet weld (leg size 10mm) at flat welding position of low carbon steel plate.
4. Manual arc welding of horizontally rotating low-carbon steel pipe with diameter greater than 89mm and wall thickness less than12 mm..
5. Beam-column welding.
Intermediate welder
I. Knowledge requirements:
1. Types, models, performance, structure, usage rules and adjustment methods of commonly used welding equipment.
2. Basic knowledge of repairing common tools, fixtures, fixtures and protective appliances.
3. The judgment method of steel weldability and the common sense of the influence of different natural conditions on weldability.
4. The main chemical composition and function of covered electrode coating, flux, welding wire, tungsten electrode and shielding gas, and the principle of selecting covered electrode, welding wire and flux.
5. Understand the welding properties, welding methods, welding process parameters and welding material selection of commonly used alloy steel, stainless steel, cast iron and non-ferrous metal materials.
6. Commonly used welding process parameters, the relationship between parameters and their influence on welding quality, and the basic knowledge of compiling process regulations.
7. The concept and purpose of preheating before welding, interlayer insulation, slow cooling after welding, heating after welding and heat treatment after welding.
8. Composition and characteristics of welded joints, changes in microstructure and mechanical properties of heat affected zone and influencing factors.
9. Principles, processing methods and quality requirements of groove form selection.
10. Basic concepts of welding deformation and stress, causes, hazards and control methods of various welding deformation and stress.
1 1. The basic principles, types, uses, operation methods and the influence of process parameters on quality of plasma arc welding and cutting.
12. the purpose and operation method of surfacing welding, the causes of welding defects and the methods of prevention and repair.
13. Common welding inspection methods and general knowledge of welding defect identification and evaluation.
14. Prevention and repair methods of welding defects.
15. Common knowledge of machining and basic knowledge of welders and electricians.
16. Basic knowledge of process planning.
17. Knowledge of production technology management.
Second, the skill requirements:
1. Inspection, adjustment and troubleshooting of common welding equipment.
2. The correct use and maintenance of commonly used welding equipment and auxiliary equipment.
3. Repair and improve tools and fixtures for personal use.
4. Understand the drawings of welded parts and draw sketches of general parts.
5. covered electrode process performance test.
6. Welding of internal and external circumferential seams and longitudinal seams of cylindrical parts.
7. Welding of the flat, vertical and horizontal welding positions of the high-pressure vessel and the product parts subjected to impact.
8. Welding of nonferrous metals and alloy steels.
9. Determine the location and degree of welding defects (cracks, slag inclusion, blowholes, incomplete penetration, etc.). ) according to x-rays.
10. Analyze the causes of welding defects and repair them until they are qualified.
Third, the work example:
1. For the butt weld of medium carbon steel plate and low alloy strength steel plate with a thickness of 10- 16 mm, manual arc welding at flat, vertical and transverse welding positions requires V-groove, and one-sided welding and double-sided forming.
2. Low alloy steel pipe with a diameter of 273-362 mm and a wall thickness of 30-50 mm, with a U-shaped groove, adopts butt joint, adopts manual TIG welding as backing at the horizontal rotation position, and adopts manual arc welding for transition and covering.
3. Fillet weld of medium carbon steel plate and low alloy strength steel plate with a thickness of 10-20 mm (the leg size is not greater than the minimum specimen thickness), manual arc welding and gas shielded welding at the flat or horizontal welding position.
4. Butt welding of low alloy strength steel pipes with a diameter of 38-60mm and a wall thickness of 3-6mm, and manual arc welding at horizontal and vertical fixed positions.
5. Argon arc welding of butt weld of austenitic stainless steel plate with thickness greater than 4 mm ..
6. Welding and welding repair of corresponding complex workpieces.
Senior welder
I. Knowledge requirements:
1. Maintenance, adjustment, debugging and acceptance methods of various welding equipment.
2. Test method for weldability of welded joints and new materials.
3. Calculation knowledge of welding strength.
4. Methods to control welding deformation and welding stress of complex components and the relationship between stress and deformation.
5. Welding method of multilayer high-pressure vessel.
6. Basic knowledge of welding metallurgy.
7. Compiling method of welding process specification and process rules for complex products.
8. Quality analysis of complex and key products and treatment methods of waste products and defective products.
9. Basic knowledge of microcomputer application.
10. Basic knowledge of improving productivity.
Second, the skill requirements:
1. Adjustment, debugging and acceptance of welding equipment.
2. Welding of dissimilar metals (low carbon steel and stainless steel, steel and nonferrous metals, etc.). ) and stainless steel composite plate.
3. Welding test and welding procedure qualification of new materials.
4. Compile the welding process specification for the combination of various welding methods.
5. Welding of all kinds of high-pressure and ultra-high-pressure containers and parts that bear great impact force.
6. Welding at any welding position.
7. Trial production and quality evaluation of complex new products.
8. Solve key technical problems in welding production.
9. Evaluate the manufacturability of welding materials.
10. Apply and popularize new technologies, new processes, new equipment and new materials.
Third, the work example:
1. Alloy steel welding.
2. It can withstand the welding of low, medium, high and ultra-high pressure pipes and pipelines of any specification and any position.
3. Welding of dissimilar metals in various joint forms, in any specifications and in any space.
4. Welding repair of complex castings.
5. All-position welding of high-pressure and ultra-high-pressure containers and parts that bear huge impact force.
6. Welding and welding repair of corresponding complex workpieces.