88 Questions
What should be the position of cylinders when using fuel gases to prevent liquid surges into the system?
Upright
What is the main factor determining the severity of an electric shock?
Amount of current
How should the gas valve be opened to ensure quick shut off in an emergency?
Not beyond the point necessary to provide adequate flow
What should be the position of the cylinders when using fuel gases?
Upright
Which organization is the technical leader in welding and related issues?
AWS
What does OSHA stand for?
Occupational Safety and Health Act
What is the unit for pressure in the metric system?
Pascal (Pa)
What is the purpose of a hot work permit?
To ensure safety precautions before operations with open flames or high heat
What is the role of a fire watch?
To observe work operations for the possibility of fires and alert workers if a fire occurs
What does NEMA stand for?
National Electrical Manufacturers Association
What is the purpose of a fuse plug?
As a heat and/or pressure relief device
What is the purpose of lock, tag, and try?
Physical locking-out of equipment, tagging it for identification, and trying the equipment to ensure it is not operable prior to beginning any repair work
What is the purpose of a fume plume in welding?
A smoke-like cloud containing minute solid particles arising directly from molten metal
What is the significance of galvanized material in welding?
It refers to any material having a zinc coating on its surface
What is the purpose of safety glasses in welding?
To protect the eyes from flying objects
What is the role of a standby in welding?
To stand by and watch for safety hazards, and to call for help if needed
What should be done in case of a fuel gas cylinder leak and fire?
Sound the fire alarm and summon trained fire personnel immediately
What is the range of steady state currents that can cause involuntary muscular reactions?
0.5 mA - 6 mA
What is the typical range of AC power sources for most electrical equipment in welding and cutting work?
115 V - 575 V
What should be checked before entry into confined spaces containing shielding gases?
Oxygen concentration
What should welders wear to prevent electric shock?
Dry gloves and clothing
What should be done to decrease the possibility of electric shock before welding?
Remove rings and jewelry
What does the work lead connect in the welding circuit?
Work terminal on the power source to the workpiece
What is the effect of water or moisture on electrical resistance?
Reduces electrical resistance
What must be done in the event of a large fire at a fuel gas cylinder?
Actuate the fire alarm, evacuate personnel, and keep the cylinder cool with a heavy stream of water
What is the threshold for shock currents that can cause direct physiological harm?
Greater than 6 milliamperes (mA)
What should be done if there are small fires near a cylinder valve or safety device?
Extinguish the fires and remove the cylinder to a safe outdoor location
What should be done to guard the connections between welding leads and power cables?
Use various mechanical means
What should be done to reduce electric shock hazards in welding?
Proper equipment installation and maintenance
What standards should welding equipment meet to ensure safety?
NEMA or ANSI standards
What is necessary for arc welding machines equipped with high-frequency arc initiating devices?
Special radio-frequency grounding
What is recommended for significant welding and cutting under electrically hazardous conditions?
Automatic machine controls that reduce open circuit voltage
What must employees receive before operating welding equipment?
Thorough electrical safety training
What must be adhered to for the installation of engine driven machines?
NFPA 70 and local codes for safety
What type of cable should welding leads be?
Flexible type of cable designed for welding service
What should the current-carrying and duty cycle capacities of equipment, cables, fuses, plugs, and receptacles prevent?
Overheating and rapid deterioration
What must be taken when connecting the grounding circuit to prevent unintended welding current flow?
Care
What key terms and definitions are relevant to welding safety practices?
ACGIH, ANSI, adiabatic recompression, ANSI Z49.1, and ANSI Z87.1
What must be done before connecting portable control devices to circuits with operating voltages above 120 V?
They must not be connected
What must protect welders from higher open circuit voltages when special welding and cutting processes require it?
Insulation and operating procedures
Which organization is the technical leader in welding and related issues?
American Welding Society (AWS)
Which agency covers the transport of materials?
Department of Transportation (DOT)
Which act outlines the requirements for safety in the workplace?
Occupational Safety and Health Act (OSHA)
What does the Threshold Limit Value (TLV) refer to?
Permissible exposure limits for hazardous materials
What do Material Safety Data Sheets (MSDS) identify?
Hazardous or toxic properties of materials in products
Which organization is involved in electrical equipment standards?
National Electrical Manufacturers Association (NEMA)
What should a welding inspector have knowledge of?
Joining and cutting processes
Why do former welders often make good welding inspectors?
Due to their hands-on experience
What do metal joining processes include?
Welding, brazing, and soldering
What do cutting processes involve?
Material removal or separation
What should the welding inspector understand about each process?
Advantages, limitations, and potential discontinuities
What is essential in welding inspection technology?
Safety measures such as hot work permits, lock, tag, and try procedures, and the use of safety glasses and protective equipment
What is recommended for significant welding and cutting under electrically hazardous conditions?
Automatic machine controls that safely reduce open circuit voltage
What must employees receive before operating equipment?
Thorough electrical safety training
What must be turned off before refueling in the case of engine driven machines?
Engine driven machines
What type of cable should welding leads be?
The flexible type of cable designed for welding service
What should be used within their current-carrying and duty cycle capacities to prevent overheating and rapid deterioration?
Equipment, cables, fuses, plugs, and receptacles
What must insulation and operating procedures protect welders from?
Higher open circuit voltages
What should be prevented when connecting the grounding circuit?
Welding current from flowing through unintended connections
What should portable control devices not be connected to?
Circuits with operating voltages above 120 V
What should equipment meet applicable standards such as ANSI/UL 551 for?
Safety in arc welding machines
What may be necessary for arc welding machines equipped with high-frequency arc initiating devices?
Special radio-frequency grounding
What must exposed metal parts of portable control devices be?
Grounded
What must be adhered to for safety in the installation of engine driven machines?
NFPA 70 and local codes
Which of the following is a group in the American Welding Society’s Master Chart of Welding and Allied Processes?
Thermal Spraying
What is the correct name for the process more often referred to as 'stick welding'?
Shielded Metal Arc Welding
What is the term for 'joining together' as used in the context of welding?
Coalescence
What is the primary source of energy to provide heating in welding processes?
Electric Arc
What is the purpose of torch brazing in the welding process?
Joining metals using a torch and filler metal
What is the common feature shared by all welding processes?
Source of energy for heating
What is the primary function of the filler metal in welding processes?
Strengthen the joint
What is the welding process that operates by heating the metal with an electric arc between a covered metal electrode and the metals to be joined?
Shielded Metal Arc Welding
What is the term for the localized coalescence of metals or nonmetals produced either by heating the materials to the welding temperature, with or without the application of pressure, or by the application of pressure alone and with or without the use of filler metal?
Welding
What is the process that employs the use of heat without pressure?
Welding
What is the welding process that uses a torch to heat the workpieces and melt a filler rod to form a joint?
Oxyacetylene Welding
What is the term for the process of joining metals using a filler metal that melts above 840°F (450°C) but below the melting point of the base metals?
Brazing
What should be done in case of a small fire near a fuel gas cylinder valve or safety device?
Extinguish the fire by closing the valve, using water, wet cloths, or fire extinguishers
What is the perception threshold for shock currents?
0.5 mA
What should be done with a large fire at a fuel gas cylinder?
Actuate the fire alarm and evacuate all personnel from the area
What is the range of arc volts used in most welding and cutting work?
Between 115 V and 575 V
What is the purpose of shielding gases in welding?
To protect the welding area from atmospheric contamination
What should be done before entering a confined space containing shielding gases?
Check for adequate oxygen concentration with an oxygen analyzer
What should be worn by anyone entering a confined space if an oxygen analyzer is not available?
An air-supplied respirator
What is the purpose of grounding the workpiece or machine in welding?
To prevent electric shock
What precaution should be taken when working in a cramped position in welding?
Avoid contact with bare conducting surfaces
What should be done before welding under damp or wet conditions?
Wear dry gloves and clothing in good condition
What is the minimum protection for the welding inspector against electrically conductive surfaces?
Rubber-soled shoes
What should be done with rings and jewelry before welding?
They should be removed to decrease the possibility of electric shock
Study Notes
Welding Safety Practices
- Proper equipment installation and maintenance, good operator practice, proper clothing and body protection, and equipment designed for the job and situation reduce electric shock hazards.
- Equipment should meet applicable NEMA or ANSI standards, such as ANSI/UL 551 for safety in arc welding machines.
- Care should be taken when connecting the grounding circuit to prevent welding current from flowing through unintended connections.
- Special radio-frequency grounding may be necessary for arc welding machines equipped with high-frequency arc initiating devices.
- Automatic machine controls that safely reduce open circuit voltage are recommended for significant welding and cutting under electrically hazardous conditions.
- Insulation and operating procedures must protect welders from higher open circuit voltages when special welding and cutting processes require it.
- Portable control devices must not be connected to circuits with operating voltages above 120 V, and exposed metal parts of these devices must be grounded.
- Employees must receive thorough electrical safety training before operating equipment, including training on points covered in ANSI Z49.1.
- Equipment, cables, fuses, plugs, and receptacles must be used within their current-carrying and duty cycle capacities to prevent overheating and rapid deterioration.
- Engine driven machines must be turned off before refueling, and installation must adhere to NFPA 70 and local codes for safety.
- Welding leads should be the flexible type of cable designed for welding service, and cable insulation must be kept in good condition.
- Key terms and definitions include ACGIH, ANSI, adiabatic recompression, ANSI Z49.1, and ANSI Z87.1, each relevant to welding safety practices.
Test your knowledge of welding inspection technology with this quiz covering metal joining and cutting processes, safety measures, industry standards, and the role of organizations like the American Welding Society and the Department of Transportation. Brush up on your understanding of welding, brazing, soldering, and material removal processes, as well as the qualifications and expertise required for welding inspection.
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