BS 638-9:1990

Brief history - Technical text
Section one. General
1. Scope
2. Object
3. Environmental conditions
4. Definitions
4.1 Power source for manual metal arc welding
4.2 Dual supply voltage welding power source
4.3 Thermal cut-out device
4.4 Reference electrode
4.5 Type test
4.6 Routine test
4.7 General visual inspection
4.8 Conventional value
4.9 Rated value
4.10 Welding current
4.11 Drooping characteristic
4.12 Duty
4.13 Conventional welding condition
4.14 No-load voltage
4.15 Rated no-load voltage (Uo)
4.16 Load voltage
4.17 Conventional load voltage (U2)
4.18 conventional welding current (I2)
4.19 Rated maximum welding current (I2max)
4.20 Rated supply voltage (U1)
4.21 Rated supply current (I1)
4.22 Rated maximum supply current (I1max)
4.23 Admissible temperature (theta ad)
4.24 Operating temperature (theta off)
4.25 Maximum winding temperature (theta max)
4.26 Reset temperature (theta on)
4.27 Heating time from the cold state (tc)
4.28 Heating time from the hot state (th)
4.29 Melting time (tf)
4.30 Number of reference electrodes nc
4.31 Number of reference electrodes nh
4.32 Basic insulation
4.33 Supplementary insulation
4.34 Double insulation
4.35 Reinforced insulation
4.36 Protection Class I equipment
4.37 Protection Class II equipment
4.38 Clearance
4.39 Creepage distance
4.40 Pollution
4.41 Pollution degree 1
4.42 Pollution degree 2
4.43 Pollution degree 3
4.44 Pollution degree 4
4.45 Micro-environment
4.46 Material group
Section two. Requirements and tests
5. Test conditions
5.1 Type tests
5.2 Routine tests
6. Protection against electric shock
6.1 Insulation
6.1.1 Clearances and creepage distances
6.1.2 Insulation resistance
6.1.3 Dielectric strength
6.2 Protection against electric shock in normal
       service (direct contact)
6.2.1 Capacitors
6.3 Protection against electric shock in case of
       a fault condition (indirect contact)
6.3.1 Protection Class I
6.3.2. Protection Class II
6.3.3 Isolation of input and welding circuit
6.3.4 Insulation between input and welding circuit
6.3.5 Placing of internal conductors
6.3.6 Movable coils and cores
7. Thermal rating
7.1 Heating test
7.2 Methods of temperature measurement
7.2.1 Thermometer method
7.2.2 Resistance method
7.3 Limits of temperature
7.3.1 Windings
7.3.2 External surfaces
7.3.3 Rectifier elements
8. Thermal protection
8.1 Construction of thermal cut-out device
8.2 Location
8.3 Operation
8.4 Resetting
8.5 Operating capacity
8.6 Indication
8.6.1 Filament signal lamps
9. Connection to the main supply
9.1 Supply voltage
9.2 Power switch
9.3 Supply cable
9.3.1 Connection of Protection Class I welding
       power sources
9.3.2 Connection of Protection Class II welding
       power sources
9.4 Input conductor terminals
9.4.1 Connection at the terminals
9.4.2 Construction of the terminals
9.4.3 Fixing of the terminals
9.4.4 Protective-conductor terminal
9.5 Cable anchorage
9.6 Dual supply voltage welding power source
10. Output
10.1 Rated no-load voltage
10.2 Conventional load voltage for type tests
10.3 Minimum output duty
10.4 Maximum and minimum welding current
10.5 Control of the welding current
10.6 Welding output connections
10.6.1 Location of socket outlets
10.6.2 Outlets openings
10.6.3 Welding cable anchorage
10.7 Electrode holders
11. Mechanical requirements
11.1 Impact resistance
11.2 Carrying means
11.3 Drop withstand
11.4 Tilting stability
12. Rating plate
12.1 Description
12.2 Contents
12.3 Tolerances
13. Control plate
14. Other use than welding
15. Instructions for use
Appendices
A. Test pins
B. Screws and connections
C. Dual voltage welding transformer
D. Impact hammer
E. Examples of rating plates
F. Examples of control plates
G. Repairs of welding power sources
H. Publications referred to
Tables
I Minimum clearances and creepage distances for
     basic insulation and supplementary insulation
II Dielectric test voltages and insulation
     resistances
III Conventional values based on the reference
     electrode
IV Limits of temperature for windings
V Torque
Figures
1. Temperature curve of windings
2. Measurement of peak values
3. Principle of the rating plate
4. 50 mm test pin
5. 15 mm test pin
6. Examples of circuit diagram of a dual voltage
     welding transformer and voltage change over switch
7. Impact hammer
8. Example of a rating place
9. Example of a subdivided rating plate
10. Example of a control plate
11. Example of a control plate of a dual voltage
     welding power source

Requirements for small power sources for use with covered stick electrodes. Intended for use, primarily, by the non-professional welder.