Hotworks and Welding Safety
Transcript of Hotworks and Welding Safety
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SHIELDED METAL ARC WELDING
(STICK WELDING)
• is an arc welding process in which
coalescence of metals is produced by
heat from an electric arc that is
maintained between the tip of a covered
electrode and the surface of the metal inthe joint being welded.
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SHIELDED METAL ARC WELDING
(SMAW)
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BASE METAL
SHIELDING
GAS
COVERING
CORE
WIRE
WELDING ELECTRODE
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FUNCTIONS OF
ELECTRODE COVERING
1. Provides gas to shield the arc.
2. Provides scavengers, deoxidizers, and fluxing
agents.
. Provides a slag blan!et.
". Provides a means of alloying elements.
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CHECK AND MAINTENANCE
BEFORE WORK
1. WELDER AND EQUIPMENT
•Provide correct power switch fuses.•#older insulation must be good.
•$%uipment must be grounded properly.
•&elding cable must not be damaged.
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CHECK AND MAINTENANCE
BEFORE WORK
2. CLOTHES AND PROTECTORS
•'orrect wor!ing clothes must be worn.
•(se safety shoes.
•Proper welding face protector or goggles must
be ready for use.
•&or!ers must wear proper gloves, arm covers,
apron and foot covers.
•(se safety belts)body harness for wor!ing up high.
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HAZARDS IN WELDING WORKS
1. $lectric *hoc! 2. +umes and ases
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HAZARDS IN WELDING WORKS
. &elding *par!s ". -rc ays
/. eneral &or! -rea
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CONTROL OF HAZARDS
IN WELDING WORKS
1. $lectric *hoc!
0nsulate welder. (se rubber mat or dry wood.
(se correct Personal Protective $%uipment PP$.
3o not touch electrically 4hot5 parts or electrode with
bare s!in or wet clothing.
6eep electrode holder and cable insulation in good
condition.
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CONTROL OF HAZARDS
IN WELDING WORKS
2. +umes and ases
Proper ventilation. 2,777 cu. ft. per min. of air per welder.
(se correct Personal Protective $%uipment PP$.
Provide room with at least 17,777 cu. ft. per welder
with a ceiling height of at least 18 ft.
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CONTROL OF HAZARDS
IN WELDING WORKS
. &elding *par!s
3o not weld on containers which have held combustible
materials.
emove flammable materials from welding area or
shield.
6eep fire extinguisher in the welding area.
(se correct Personal Protective $%uipment PP$.
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CONTROL OF HAZARDS
IN WELDING WORKS
". -rc ays
-lways use helmet or mas! when welding.
(se correct lenses.
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FILTER SHADE SELECTION
OPERATION ARC MIN. SUGGESTED
CURRENT SHADE SHADE
(a!)
*hielded 9etal 87 : ;
-rc &elding
87 < 187 = 17
187 < 2/7 17 12
2/7 < //7 11 1"
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CONTROL OF HAZARDS
IN WELDING WORKS
/. eneral &or! -rea
6eep cables, materials, tools neatly organized.
'onnect wor! cable as close as possible to area where
welding is being performed.
-lways disconnect power to e%uipment before servicing.
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HOT WORK PERMITS
&hat is a #>? &>6 P$90?@
- written permit or authorization
before welding or cutting
operations are allowed in
establishments in which the area
shall be inspected by the safety
man indicating therein theprecautions to be followed to
avoid fire or accidents.
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HOT WORK PERMITS
3efinitionA
HOT WORK is any wor! using open flames
or sources of heat that could ignite
materials in the wor! area.
&elding
Brazing
*oldering>xy
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HOT WORK PERMITS
ProceduresA
Before beginning hot
wor!, contact the +ire9arshal, *afety >fficer,
or 9aintenance 9anager
to have a #ow &or!
Permit issued.
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HOT WORK PERMITS
$ffectivityA
Permits are issued for
the specific job beingdone, and for a specific
time period. ?he time
period is usually for the
wor!ing shift, but maynever exceed twenty four
hours.
CUTTING WELDING HOT WORK PERMIT
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CUTTING – WELDING – HOT WORK PERMIT
This form is to be fill out in its entirety by the responsible person actually performing the “HOT WORK” andthen brought to the Safety Officer for approval prior to beginning the project
Company: Date:
Responsible Peson: !tat time:
Wo" to be pe#ome$: %&il$in':
Is it possible to pe#om t(is )o" in t(e s(op* +es,,,, No,,,,
Room N&mbe- .ea o E/&ipment:
Please pla0e a 0(e0" ma" i# t(e #ollo)in' items (a1e been 0omplete$
!lame or spar"#producing e$uipment to be used has been inspected and found in good repair ,,,,
Sprin"lers% &hre provided% are in commission and )ill not be ta"en o&t o# se1i0e )(ile this &or" is being
done ,,,,
There are no combustible fibers% dusts% vapors% gases or li$uids in the area Tan"s and e$uipment previously
containing such materials have been purged The absence of gases or vapors has been verified by acombustible gas detection instrument 'f there is a possibility of a lea" developing in nearby piping%
e$uipment% or tan"s% this area is being continuously monitored Call t(e !a#ety O##i0e i# assistan0e isnee$e$ to test aea ,,,,
!ire alarms &ill not be ta"en o&t o# se1i0e &hile &or" is being performed 'f alarm system must beinactivated during &or" then Safety Officer &ill be contacted prior to ta"ing alarm out of service so that a
suitable “fire &atch” can be coordinated Un$e no 0i0&mstan0es )ill #ie alams be ta"en o&t o# se1i0e )it(o&t 0onta0tin' t(e !a#ety O##i0e ,,,,
The &or" & ill be confined to the area or e$uipment specified on this permit ,,,,
Surrounding floors have been s&ept clean and% if combustible% &et do&n ,,,,
(ontractor has ample portable fire e)tinguishers available and trained personnel to use them ,,,,
*ll combustibles have been relocated +, feet from the operation and the remainder protected &ith metal
guards of flame#proofed curtains or covers -not ordinary tarpaulins. ,,,,
*ll floor and &all openings &ithin +, feet of the operations have been tightly covered ,,,,
Responsible personnel have been assigned to provide a “!ire Watch” for dangerous spar"s in the &or" area%as &ell as on floors above and belo& &hile &or" is being performed ,,,,
*rrangements have been made to provide a “!ire Watch” to patrol the area% including floors above and
belo&% duringany lunch or rest period and for at least one#half hour after the &or" has been completed
,,,,
' attest that the above precautions have been ta"en
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, Peson Responsible #o Pe#omin' Hot Wo"
*pproved
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Name o# !a#ety O##i0e an$ Date
NOTE: T(is pemit e2pies 34 (o&s a#te t(e $esi'nate$ 5stat time67