A Fuse Will Open A Circuit When Excessive Current Flow What You Should Know about SMAW

You are searching about A Fuse Will Open A Circuit When Excessive Current Flow, today we will share with you article about A Fuse Will Open A Circuit When Excessive Current Flow was compiled and edited by our team from many sources on the internet. Hope this article on the topic A Fuse Will Open A Circuit When Excessive Current Flow is useful to you.

What You Should Know about SMAW

In shielded arc welding, the intense heat from the electric

an electric arc is used to melt and fuse metals to form a weld. It’s one of the

the oldest and most widespread welding procedures. Although used

mainly for joining iron and mild steel, shielded metal arc

welding is well suited to maintenance tasks because

the equipment is relatively cheap, easy to operate and can

used for welding various types of metals.

Below you will find explanations that describe the protected

metal arc welding process and how welding machines and

plugins are installed and used. You will also find information

when choosing an electrode. Personal protective equipment i

precautions are also described.

How the process works

Typical SMAW equipment consists of an electric welding machine,

two welding cables, grounding clamp, electrode holder ia

covered metal electrode. Electric current from welding

the machine is used to create an electric arc between the tip

electrode and work.

Welding starts by touching the end of the electrode

base metal, then raise the electrode about ¼ inch. This forms

arc, which produces temperatures up to 5550°C. Intensively

the heat in the arc area instantly melts the base metal and begins

burn the covering off the electrode and melt the core.

The molten core becomes the filler metal for welding and

the breakdown of the flux creates a protective gaseous atmosphere

around the port area. The gas forms a shield against contamination

from oxygen and nitrogen in the surrounding air. Additional

protection is provided by the current of the electrode, which forms a

a deposit called slag.

The shielding gas is ionized, conducts electricity and

maintains the stability of the arch.

Welding voltage and current

Direct current (DC) or alternating current (AC) is used.

Arc voltage or operating voltage is the voltage present in the

welding circuit while the arc is lit and welding is performed.

The arc voltage ranges from 15V to 40V depending on the arc

lenght.

Open circuit voltage is the voltage generated by welding

machine when not welding. The open circuit voltages are

normally set between 50V and 100V, but drops to arc voltage

level when the arc is ignited and welding begins.

Arc length

In every electrical circuit there is a correlation between

voltage, current and resistance. The best results are

it is usually obtained with an arc length of about the diameter

electrode.

When the arc length increases, less current flow occurs

due to increased resistance. The result is a cooler onion

and greater tendency to splash. It will be less

weld penetration, increased exposure to oxidation and

contamination and irregular, unstable arc.

When the arc length decreases, the lower the resistance, the higher the current

flows with a lower voltage and the arc becomes hotter. With thin

material, heat can melt the weld hole, porosity and

trimming the adjacent base metal.

Polarity

For DC machines this is important. When the electrode

negative, and the workpiece is positive, this is called flat

Polarity. The opposite of this is reverse polarity.

DCSP or direct current polarity is characterized

faster melting of the electrode, where the welded vessel is wide and

penetration into the base metal is relatively shallow. This is

it is used when there are high welding speeds and high deposition rates

required.

DCRP or reverse direct current polarity results in a hotter arc,

creating a deeper, narrower welded vessel. This is used for structural

welding, multi-pass welding and applications requiring deep

penetrations.

Most electrodes are designed for use with only one polarity.

Energy sources

Most AC power supplies contain a step-down transformer

voltage to the level required for welding (usually less than

100 V)

Welding machines

Many types and sizes of welding machines are used for protection

metal arc welding. Current of the constant current type

does not change significantly in arc length variations. This is

preferred for manual welding operations.

The constant potential welding machine adjusts

current according to arc length. If used in the manual

operation, will produce unavoidable variations in arc length

large current fluctuations, resulting in unstable,

uneven arc. For automatic operations, constant electrode

feed rate establishes a stable arc and uniform arc length.

The current rating of the machine is its maximum current output.

A rated current of 400 amps means that the machine can deliver up to

400 amperes of welding current.

The rating of the working cycle of the machine is safe operation

capacity for non-stop welding. This is expressed as a

percentage during the 10-minute period during which the machine can

delivers its rated maximum welding current output without damage

or overheating. An 80 percent 400 amp machine is one that can

deliver 400 amps of welding current for a total of 8 minutes

out of every 10, and must be idle for at least 2 minutes out of every 10

for cooling.

Tools and accessories

Tools for SMAW are: cables, holders, clamps, breaker hammer,

wire brush. Protective equipment is a face shield, glasses,

apron, gloves, shoes, long-sleeved shirt. Protective

equipment is to avoid eye injuries and burns. There is also an i

it is necessary to prevent electric shocks, especially in wet areas.

Electrode selection

Electrodes are classified according to core material: mild steel,

high carbon steel, special alloy steel, cast iron and

non-ferrous. Most often, mild steel electrodes are used.

In general, the electrode core material is equally matched

which is possible with the composition of the base metal. Electrode

the size varies depending on the thickness of the base metal.

Size and characteristics of the selected electrode

determine the arc current settings on the welding machine.

Normally, the recommended amperage range for the electrode

provided by the manufacturer.

Installation and operation

Observe fire precautions before starting welding. Not

flammable should be near the work area.

While the electricity is still out; attach the ground wire to

the workpiece and the electrode on the holder. Turn it on

power. Place the end of the electrode to ignite the arc

about 1 inch above the initial weld point. Put your face down

shield and touch with a quick tap or scratching motion

metal-based electrode. Right after

contact, lift the tip of the electrode slightly to make contact

an arc whose length is approximately equal to the electrode

diameter.

If you don’t lift the electrode fast enough, it will stick

to work. Twist or bend the electrode to release it. If

the electrode does not release, release it quickly

bracket. With a little practice, you can learn to fire a bow

without gluing the electrode.

When the current settings and arc length are correct

if maintained, a continuous popping sound is heard during welding.

A humming sound indicates that the arc length is too long or

the current is too high. Bows that are too short create a snapping sound

and may flash on and off, indicating that the electrode has stuck

and a short circuit to the base metal.

Make “hard to find” tools “easy to find”. You can only produce

YOUR BEST with the BEST!” Earn praise for a job well done,

only with the RIGHT TOOLS! Find hard-to-find tools for yours

garage and workshop. Good for cars, trucks, bikes, boats and

Airplanes.

Tools that are hard to find

Video about A Fuse Will Open A Circuit When Excessive Current Flow

You can see more content about A Fuse Will Open A Circuit When Excessive Current Flow on our youtube channel: Click Here

Question about A Fuse Will Open A Circuit When Excessive Current Flow

If you have any questions about A Fuse Will Open A Circuit When Excessive Current Flow, please let us know, all your questions or suggestions will help us improve in the following articles!

The article A Fuse Will Open A Circuit When Excessive Current Flow was compiled by me and my team from many sources. If you find the article A Fuse Will Open A Circuit When Excessive Current Flow helpful to you, please support the team Like or Share!

Rate Articles A Fuse Will Open A Circuit When Excessive Current Flow

Rate: 4-5 stars
Ratings: 8925
Views: 76647202

Search keywords A Fuse Will Open A Circuit When Excessive Current Flow

A Fuse Will Open A Circuit When Excessive Current Flow
way A Fuse Will Open A Circuit When Excessive Current Flow
tutorial A Fuse Will Open A Circuit When Excessive Current Flow
A Fuse Will Open A Circuit When Excessive Current Flow free
#SMAW

Source: https://ezinearticles.com/?What-You-Should-Know-about-SMAW&id=25232

Related Posts