Hand welding practice problem_vii - Edwards @ Wiki

6 Disaster prevention in welding work

Question 7.1 Clothes and fittings for welding work

1. Select cotton work clothes

Question 7.2 Protection required for welding

1. Wear protective hat for high place work of 2 [m] or more

Question 7.3 Disaster prevention against welding work

1. Wear gas mask and gas mask against toxic gas
2. Wear a dust mask against Hume
3. Appropriate filter plate is selected for generation of arc light

Question 7.4 Outline of protective eyeglasses

1. Wear safety glasses for welding work
2. Light transmission decreases with increase in light blocking number
3. Protect your eyes from scattered light and scattered slag etc.

Question 7.5 Protective mask overview

1. Wear dust mask and perform arc welding operation
2. Wear an air supply mask against the assumption of oxygen deficiency
3. Perform periodic inspection against deterioration of mask

Question 7.6 Electrical shock overview

1. Attract electric shock to high no-load voltage
2. The incidence of electric shocks rises in narrow places such as inside boilers
3. Risk of alternating current power is increased due to direct current power
   to ventricular fibrillation of the heart
4. Use holders conforming to standards for insulation and heat resistance

Question 7.7 Measures against electric shock

1. Use welding rod holder conforming to JIS standard
2. Inspect covering condition for input / output cables in welding machine
3. Connect securely to ground between power supply side distribution box (outer case)
   and welding machine

Question 7.8 Measures against electric shock (electric shock)

1. Shy away from independent work in a narrow place
2. An electric shock prevention circuit is interposed in a working welding machine
   at a high place or narrow place of 2 m or more
3. Check electric shock prevention device before starting welding

Question 7.9 Dealing with occurrence of electric shock accident

1. Electric shock accident Victims are immediately isolated from power supply

Question 7.10 Warning operation notes

1. Appropriate light shielding shoji is selected for arc light Used protected surface

Question 7.11 Disaster countermeasure in welding work

1. Eliminate combustible materials near the work area
2. Avoid working near inflammable substances
3. Consideration for sputtering

Question 7.12 Measures for Oxygen Deficiency Disaster

1. Use airline mask and safety belt for fall prevention due to oxygen deficiency
2. Appoint a watcher other than welding workers
3. Special education for oxygen deficiency risk work Termination person finished work

Question 7.13 Notes on high place welding work

1. Interruption or postponement of work against bad weather
2. Wear protective hat
3. Wear safety belt

Question 7.14 Disaster prevention measures of arc welding

1. Prevent electric shock accidents by reliable grounding on welding machine

Question 7.15 Harmful ray of arc light

1. Ultraviolet
2. Infrared

Question 7.16 Selection of shading glass by welding method

1. Omit

Note

• steel sheet
  • Thin plate: Thickness less than 3 [mm]
  • Middle plate: Thickness 3 [mm] or more and less than 6 [mm]
  • Thick plate: more than 6 [mm] thick
  • Thick plate: Thickness 150 [mm] or more

Question 7.17 Secure safety in welding operation

1. Omit

Question 7.18 Environment in welding operation

1. Install local exhaust system equipment for welding work compartment
2. Ensure ventilation based on dust prevention and measures against fume
3. Measures against dust and fumes by dust mask
4. Exhaust dust and fumes by ventilating the work area

Question 7.19 Functions of electric shock prevention device

1. Voltage limited to 25 [V] or less for manual welded covered arc welding machine

Question 7.20 Disaster countermeasures against welding

1. Shielding against surrounding workers Prevent arc light damage
2. Interdiction of electric shock prevention circuit based on electric shock prevention
3. Countermeasures against gas leakage by earthquake damage by gas detector based
   on prevention of gas explosion disaster

Question 7.21 Securing safety for high place work

1. Wear safety clothes and anti-slip shoes for work clothes
2. Measures against falling by wearing a safety belt
3. Arrangement based on prevention of falling of tool
4. Inspection as a preparation for work and confirmation of surrounding situation

Question 7.22 Wearing protective equipment

1. Wear safety hat

Question 7.23 Shading glass

1. Absorbs harmful rays such as ultraviolet rays and infrared rays
   and prevents injuries of eyes

Question 7.24 Measures against electricity, arc, fumes and spatter

1. Electric disaster / countermeasure
   1. Electric shock / fall from altitude due to loss of consciousness
   2. Secure addition of electric shock prevention device / ensuring insulation
2. Arc light
   1. Electric ophthalmitis / injury to the skin
   2. Wear filter plate / protective equipment
3. Welding hume
   1. Gas poisoning / pneumoconiosis
   2. Poison mask / dust mask
4. Sputtering
   1. Burn / Fire
   2. Wearing proper protective equipment / Elimination of combustibles

Question 7.25 Defining height work

1. Working with foot soles under 2 [m]

Question 7.26 Ray outline of arc light

1. Visible light / ultraviolet / infrared etc.

Question 7.27 Causes of light burns

1. Attracted by ultraviolet rays

7.28 Work environment overview

1. Work from windward to welding to galvanizing or painting
2. Measures against metal vapor and fumes for galvanized steel
3. Inflicting metal heat with zinc fume and metal vapor suction

Question 7.29 Disaster excerpts in welding work

1. fire
2. burn
3. Eye flame
4. Electric shock
5. Pne
6. Falling

Question 7.30 Measures against electric shock

1. Intervention of electric shock prevention circuit
2. Reliable grounding
3. Elimination of conductors other than welding
4. Measures against moisture

Question 7.31 Arc light disaster excerpt

1. Eye flame
2. burn