This book is written according to the requirements of the syllabus of covered electrode Arc Welding Training, the main course of welding major in secondary vocational schools in 2 1 century. This book focuses on covered electrode arc welding power supply and tools, the composition, classification and application of covered electrode, covered electrode arc welding operation skills, welding defects, welding labor protection and safety inspection. The content of this book aims to highlight the characteristics of vocational education, with appropriate theoretical knowledge and practicality. On the basis of the textbook 1, the project training of 13 is added, which makes the theory teaching closely combined with practice.

This book can be used for covered electrode arc welding training of welding specialty in secondary vocational schools, and can also be used as a reference for welder training.

catalogue

Preface to the second edition

Preface to 1

Introduction.

First, the nature and classification of welding

Second, the characteristics and application of covered electrode arc welding.

Third, the main content of this course

Fourth, the purpose and method of learning this course

The first chapter covered electrode arc welding power supply and tools

Section 1 Introduction of Common Welding Power Sources

First, the basic requirements for arc welding power supply

Second, the compilation and main types of arc welding power supply

technical parameter

Three, commonly used covered electrode arc welding power supply

Four, the correct use of arc welding power supply,

Section 2 Installation of Arc Welding Power Supply-

A, the general requirements of arc welding power supply installation

Two. Installation of arc welding transformer-

Third, the installation of arc welding rectifier

Section 3 Common Tools and Measuring Tools for Arc Welding in covered electrode

First of all, common tools

Second, common measuring tools-

Project training: correct installation of single arc welding power supply

Adjustment of welding current of double arc welding power supply for engineering training

Chapter II Composition, Classification and Selection of Coated covered electrode.

Section 1 Components of Coated covered electrode

First, weld core one.

Second, coating

Section II Classification, Model and Brand of covered electrode

I. Classification of covered electrode

Second, covered electrode model ..

Third, covered electrode brand

Section III Selection, Storage and Use of covered electrode

I. covered electrode's Choice-

Second, the storage, distribution and use of covered electrode.

Project training III covers the choice of covered electrode.

Project Training IV Correct Use of covered electrode

The third chapter covered electrode arc welding operation skills

The first section welding joint form, weld form

And code name

A, welding joint form

Second, the weld form

Third, welding specifications.

Four, welding method and its classification number

In the second quarter, the basic operation technology of covered electrode arc welding.

First, strike the arc.

Operation steps of arc striking in practical training

Second, shipment.

Three, the beginning, end and connection of weld

Operation steps of actual two-layer welding

Five-level welding for project training

The third quarter welding parameters

First, the choice of covered electrode brand and covered electrode diameter.

Second, the choice of welding power source type and polarity

Third, the choice of welding current

Fourthly, the choice of arc voltage.

Verb (abbreviation of verb) Selection of welding speed

Six, the choice of weld layer

Seven, the choice of welding heat input

Section 4 Welding of Welds in Different Positions

First, flat welding

Operation steps of training three-layer horizontal fillet weld

Practice the operation of two horizontal fillet welds on the fourth floor and the first floor

step

Project training six 6mm steel plate I-groove butt joints.

welding by both sides

Project training VII 10mm V-groove flat butt joint of steel plate

welding by both sides

Project training 8: 16 ram steel plate X-groove butt joint

welding by both sides

Second, the transverse welding

Operation Steps of Five Horizontal Butt Welding in Practical Training

Project training nine-corner welding

Third, vertical welding.

Operation steps of six kinds of vertical welding in practical training

Practical seven-corner welding operation steps

Project training 10 V groove vertical butt welding

Project training eleven vertical fillet welding

Four, overhead welding

Practical eight vertical welding operation steps

Section 5 Application of covered electrode Arc Welding Operation Technology

First, tack welding and tack welding seam

Second, the welding of thin plate 1

Project training 1 23mm steel plate butt welding1

Third, pipeline welding "

Exercise 9 Butt welding operation steps for fixed pipes 1

Practice the operation steps of ten-tube all-position welding. "

Practice 1 1 All-position welding operation of horizontal fixed pipe.

first step

Four, one-sided welding and double-sided forming welding technology 1

Thirteen V-shaped grooves are trained in the project, one side is welded and the other side is welded.

Cheng Yi

Chapter IV Welding Defects

Section 1 Overview "

First, the harm of welding defects

Second, the importance of welding quality inspection

Section 2 Welding Defects and Countermeasures

I. Cracks

Second, pores

Third, the size and shape of the weld do not meet the requirements.

Fourth, bite the edge. "

Five, arc pit.

Six, arc injury'

Seven. Incomplete penetration and incomplete fusion'

Eight, slag inclusion'

Nine, penetration "

X. Flash'

XI。 The amount of splashing

Chapter V Welding Labor Protection and Safety Inspection

Section 1 Protection of Welding Labor'

I. Types and Use of Labor Protection Articles

Request'

Second, the correct use of labor protection articles

Section 2 Welding Safety Inspection

A, welding site, equipment safety inspection

Second, the fixture safety inspection

refer to