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•  Repair or replace defective cables immediately.
•  Never watch the arc except through 

lenses of the correct shade.

•  In confi ned spaces, adequate ventilation 

and constant observation are essential.

•  Leads and cables should be kept clear 

of passageways.

•  Keep fi re extinguishing equipment at a handy 

location in the shop.

•  Keep primary terminals and live parts 

effectively covered.

•  Never strike an electrode on any gas cylinder.
• Never use oxygen for venting containers.

1.0  Recommended Safety Guidelines 

Diagram and safety explanation 

Electrical safety alert

Welding electrode causing 
electric shock

Fumes and gases coming from 
welding process

Welding arc rays

Read instruction manual

Become trained

Diagram and safety explanation 

Wear dry, insulated gloves

  Insulate  yourself  from 
work and ground

Disconnect input power before 
working on equipment

Keep head out of fumes

Use forced ventilation or local 
exhaust to remove fumes

Use welding helmet with 
correct shade of fi lter

Some safety precautions BOC recommends are as follows:

Summary of Contents for MMA 140

Page 1: ...MMA140 160 O P E R AT I N G M A N U A L...

Page 2: ...es not assume any responsibility for updating any information or correcting any error or omission which may become apparent after the document has been issued Neither BOC nor any of its agents has ind...

Page 3: ...WeldingTechniques 7 3 1 Fundamentals of Manual Metal Arc MMA Welding 7 4 0 Machine Specifications and Contents 9 4 1 Operating Controls 9 4 2 Package Contents 9 5 0 Operating Functions 10 5 1 Operati...

Page 4: ...ylinder Never use oxygen for venting containers 1 0 Recommended Safety Guidelines Diagram and safety explanation Electrical safety alert Welding electrode causing electric shock Fumes and gases coming...

Page 5: ...paces Be alert to this at all times Keep your head out of the fumes rising from the arc Fumes from the welding of some metals could have an adverse effect on your health Don t breathe them in If you a...

Page 6: ...ator and will void your warranty Only qualified personnel approved by BOC should perform repairs Always disconnect mains power before investigating equipment malfunctions Parts that are broken damaged...

Page 7: ...aining a stable arc The electrode tends to stick to the work penetration is poor and beads with a distinct rounded profile will be deposited Excessive current is accompanied by overheating of the elec...

Page 8: ...o slow a rate of travel will frequently lead to arc instability slag inclusions and poor mechanical properties Correct work preparation The method of preparation of components to be welded will depend...

Page 9: ...s and Contents 4 1 Operating Controls 1 2 6 4 3 5 4 2 MMA 140 Package Contents MMA140 Power source Electrode holder with cable dinse connector Work clamp with cable dinse connector Primary cable with...

Page 10: ...electrode holder the machine should be switched off using the power switch on the machine In addition the main supply must be turned off and the plug removed from the outlet socket 5 1 Operating Machi...

Page 11: ...60 50 60 Rated input plug A 10A 15A Output current adjustment A 15 140 15 160 Output voltage V 20 6 25 6 20 6 26 4 No load voltage V 18 18 Duty cycle 20 120A 20 160A Power factor 0 73 0 73 Efficiency...

Page 12: ...bleshooting Main switch signal light is not lit Unit does not get electricity Check mains fuses Check mains cable and plug Unit does not weld well Arc is uneven and goes off Electrode gets stuck in we...

Page 13: ...authorised manager of BOC This warranty is in addition to any other legal rights you may have Electrode holders and torches are not covered 8 2 Limitations on Warranty The following conditions are not...

Page 14: ...14...

Page 15: ...15...

Page 16: ...n in this document are believed to be correct at the time of printing Whilst proper care has been taken in the preparation no liability for injury or damage resulting from its improper use can be acce...

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