[notice] national occupation standard welder |
A definition of occupation,
The operation of welding and cutting equipment, metal workpiece welding or cutting molding personnel.
Two, basic knowledge:
1, knowledge map
(1) simple assembly drawing and reading knowledge;
(2) reading knowledge of welding assembly;
(3) welding and welding method code symbol representation.
2, metal and heat treatment knowledge
(1) the general knowledge of metal crystal structure;
(2) the basic organization structure and iron carbon alloys;
(3) the structure and application of Fe - C phase diagram;
(4) the basic knowledge of heat treatment of steel.
3, knowledge of common metal materials
(1) physical, chemical and mechanical properties of metal materials;
(2) carbon steel, alloy steel, cast iron, nonferrous metal classification, grade, composition, properties and uses.
Basic knowledge of electrical, 4
(1) the basic knowledge of direct electrical and electromagnetic;
(2) the basic concept of communication;
(3) the structure and basic principle of transformer;
(4) the ammeter and voltmeter using method.
Basic knowledge of chemistry, 5
(1) chemical elements;
(2) atomic structure;
(3) chemical reaction type pinyin.
6, health and safety and environmental protection knowledge
(1) the knowledge of electricity;
(2) the welding environment protection and safety operation rules;
(3) knowledge of labor protection welding;
(4) safety rules for the operation of special conditions and materials.
7 basic knowledge and cold processing
(1) the basic knowledge of fitter;
(2) the basic knowledge of sheet metal.
Three, job requirements
intermediate
Occupation function
Work content
Skill requirements
knowledge
A,
weld
front
accurate
prepare
(a) safety inspection
Can the site safety inspection equipment, fixture
The rules for safe operation
(two) the preparation of welding materials
1, the correct selection and use of common metal electrode
Welding metallurgy principle
The use of 2 commonly used metal materials, electrode selection
2, the correct selection and use of flux
1, the effect of flux
Classification and type 2, flux
3, the use of flux
3, the correct selection and use of protective gas
The types and properties of 1, protective gas
2, the use of protective gas
4, the correct selection and use of wire
Type, composition, properties and use of wire
(three) work preparation
1, welding groove can prepare different positions
2, can control the welding deformation
3, can be preheated before welding
4, welding group for welding and positioning
1, different welding groove selection
2, knowledge of welding deformation
3, preheating before welding and method
4 basic requirements, and positioning welding group
(four) preparation equipment
1, to select the right hand arc welding, submerged arc welding, gas welding, resistance welding auxiliary device
1, classification and composition of submerged arc welding machine
2, the working principle of submerged arc welding machine
3, TIG welding machine and auxiliary equipment
4, carbon dioxide gas shielded welding machine and auxiliary equipment
Two,
weld
meet
Can use the commonly used welding methods commonly used for welding of metallic materials
(a) commonly used connection method using stack (according to the declaration of an optional)
1, manual electric arc welding
Melt-through bead 1, can carry out low carbon steel plate butt welding, horizontal welding
2, can the overhead welding of low carbon steel plate butt.
3, to a low carbon steel pipe vertical fixed melt-through bead
4, to the level of low carbon steel pipe welded
1, different positions of the welding parameters
2 points, different location technology
2, submerged arc welding
1, can the operation of submerged arc welding machine
1, buried the working principle, characteristics and application range of arc welding
2, adjust the principle of automatic submerged arc welding
2, can choose the correct submerged arc welding parameters
The parameters of submerged arc welding process
Butt welding of double sides 3, can be in the plate,
Submerged arc operation
3, tungsten argon arc welding
1, to correct selection of manual TIG welding process
2, to the manual tungsten electrode argon arc welding near melt-through bead
3, can carry out manual tungsten argon arc welding near the base, manual electric arc welding filling and covering
1, manual TIG welding principle, characteristic and Application
2, manual TIG welding craft parameters of TIG welding operation points
4, carbon dioxide welding
1, to correct selection of semi automatic carbon dioxide welding process
1, carbon dioxide welding principle characteristic and Application
2, the carbon dioxide gas shielded welding droplet transfer and spatter
3, semi automatic carbon dioxide welding process
2, to carry out a variety of positions melt-through bead semi-automatic carbon dioxide welding plate
Semi automatic carbon dioxide welding operation points
5, resistance welding
1, to correct selection of resistance welding process parameters
2, can carry out resistance welding operation
3, can carry out spot welding, butt welding of steel sheet
1, resistance welding principle, classification, characteristics and application scope
2, the spot welding technology
3, welding process
4, spot welding and butt welding operation points
6, plasma welding and cutting
1, capable of plasma cutting of austenitic stainless steel
The characteristics and classification of plasma arc
2, can carry out welding of austenitic stainless steel
1, the classification method of plasma welding
2, plasma welding process
7, the use of other welding methods (welding)
To use the method of welding welding
Principle and application of 1 and other welding methods
2, other welding equipment and process method
(two), joint welding quality control
1, to control the microstructure and performance of welding joint
1, can appear in the welding joint microstructure after welding control
1, the weld pool, a crystallization of the two crystallization