My SMAW NC-II.pptx........................

Shielded Metal Arc Welding (SMAW) NC-II
Competency Standards
Basic
Receive and respond to workplace communication
Work with others
Demonstrate work values
Practice basic housekeeping procedures
Common
Apply Safety Practices
Interpret Drawings and Sketches
Perform Industry Calculations
Contribute to Quality System
Use Hand Tools
Prepare Weld Materials
Setup Welding Equipment
Fit up Weld Materials
Repair Welds
Core
Weld Carbon Steel Plates & Pipes Using SMAW
QUALIFICATION TITLE:
UNITS OF
COMPETENCY

At the end of the lesson the student shall be
able to;
A. understand the three
competencies standard
B. discuss the basic, common
and core competencies
Apply the core, competency
Value the important of
competencies

Practice Basic Housekeeping Procedures
Housekeeping is not just
cleanliness. It includes keeping
work areas neat and orderly;
maintaining halls and floors free of
slip and trip hazards; and removing
of waste materials (e.g., paper,
cardboard) and other fire hazards
from work areas.

What are some benefits of good housekeeping
practices?
 Effective housekeeping results in:
 reduced handling to ease the flow of materials
 fewer tripping and slipping accidents in clutter-free and spill-free
work areas
 decreased fire hazards
 lower worker exposures to hazardous substances (e.g. dusts,
vapors)
 better control of tools and materials, including inventory and
supplies
 more efficient equipment cleanup and maintenance
 better hygienic conditions leading to improved health
 more effective use of space
 reduced property damage by improving preventive maintenance
 less janitorial work
 improved morale

5 S
1. Sort (Seiri)– Throw away all rubbish and
unrelated materials in the workplace
2. Stabilize / Set order (Seiso) – Set everything
in proper place for quick retrieval and storage
3. Shine (Seiton) – Clean the workplace;
everyone should be a janitor
4. Standardize (Sheiketsu) – standardize the
way of maintaining cleanliness.
5. Sustain / Self discipline (Shitsuke) – Practice
5S daily-make it a way life; this is also means
commitment

Apply Safety Practices
1
.
2
.
3
.

Perform Industry Calculation
Two Systems of Measurement
 English System
 Metric System
1. English System - The English system of linear measure
(measure in straight line) is the standard adopted by
American industry. The common unit of length is the
inch. The inch may divided into common fraction parts
or decimal fraction parts.
The fractional system divides a whole into equal parts,
or halves. A half can be divided into equal quarters, a
quarter into eighths, an eight into sixteenths, and so on.

 Example of English measurement:
1”
1/16”
1/8”
3/16”
1/4”
5/16”
3/8”
7/16”
1/2”
9/16”
5/8”
11/16”
3/4”
13/16”
7/8”
15/16”
16/16
or 1”

2. Metric System – more convinient to use because
of its decimal basis. Common units millimeter
(mm), centimeter (cm), meter (m), etc.
Example:

Set-up Welding Equipment
SMAW - Shielded metal arc welding (SMAW), also known
as manual metal arc welding (MMA or MMAW), flux
shielded arc welding or informally as stick welding, is a
manual arc welding process that uses a consumable
electrode coated in flux to lay the weld. An electric current,
in the form of either alternating current or direct current
from awelding power supply, is used to form an
electric arc between the electrode and the metals to be
joined. As the weld is laid, the flux coating of the electrode
disintegrates, giving off vapors that serve as a shielding gas

Because of the versatility of the process and the
simplicity of its equipment and operation, shielded
metal arc welding is one of the world's most popular
welding processes. It dominates other welding
processes in the maintenance and repair industry,
and though flux-cored arc welding is growing in
popularity, SMAW continues to be used extensively
in the construction of steel structures and in
industrial fabrication. The process is used primarily
to weld iron and steels (including stainless steel) but

When wires are connected one to the positive
and one to the negative terminal of a fully
charge battery, and the bare wires ends brought
together a spark will be produced. The heat
generated by this spark will cause the ends of the
wires to melt. This is the principle of electric arc
welding. An electric arc welding is a sustained
spark between two poles or electrodes. Welding
is the process of fusing together of two pieces of
metal to form a single solid mass.

TYPES OF ARC WELDING MACHINES
 AC ( Alternating Current) transformer
welder
 AC-DC Transformer rectifier
 Motor Generator
 Engine Generator

AC – DC Transformer Rectifier

WELDING CURRENTS
 Alternating Current (AC)
 Direct Current Straight Polarity – DCSP
Direct Current Electrode Negative – DCEN
 Direct Current Reversed Polarity – DCRP
Direct Current Electrode Positive - DCEP

Alternating Current (AC)
AC Welder
50%Heat
50%Heat

Direct Current Straight Polarity – DCSP
Direct Current Electrode Negative – DCEN
30%Heat
70%Heat

Direct Current Reversed Polarity – DCRP
Direct Current Electrode Positive - DCEP
70%Heat
30%Heat
DC Welder

Groove edge preparations
Prepared Weld Materials

TYPES OF ELECTRODES
 Mild Steel
 Low hydrogen-low alloy
 Non –ferrous
 Hard surfacing
 Cast iron
 Stainless steel

Carbon and Loy Alloy Steel Covered
Electrodes
The AWS specification for carbon steel covered electrodes
is A5.1, and for low alloy steel covered arc electrodes it is
A5.5

 1 - In a E601X means all positions, flat,
horizontal,
vertical, and overhead
 2 – In a E602X means horizontal
 3 – In an E603X is an old term no longer used,
it meant flat only
 4 – In a E704X means flat, horizontal,
overhead
and vertical-down

Carbon and Loy Alloy Steel Covered
Electrodes
Welding currents

Factors for selecting electrodes
 Type of electrode
 Type of current
 Type of metal
 Thickness of metal
 Welding position
 Joint design
 Surface condition
 Number of passes
 Distortion
 Service condition and/or specification
 Production efficiency and job condition

FUNDAMENTALS OF ARC WELDING
PROCESS
Skills to be performed to achieve a Quality Weld
 Correct Arc Length
 Proper travel speed
 Correct electrode angle
 Correct electrode size
 Correct amperage
 CLAMS

CORRECT ARC LENGTH
Arc length is the distance the arc must jump from
the end of the electrode to the plate

CORRECT TRAVEL SPEED/ WELD BEAD
Stringer Bead – a straight weld bead on the surface
of the plate with little or no side to side electrode
movement.
Weaving – a technique of depositing weld metal in
which the electrode is oscilated

CORRECT ELECTRODE ANGLE
 Leading Electrode Angle pushes molten metal
and slag ahead of the weld.
 Trailing electrode Angle pushes the molten metal
away from the leading edge of the molten pool
toward the back where it solidifies.

LEADING ANGLE & TRAILING ANGLE

EFFECT OF TRAILING ANGLE ON WELD BUILD UP,
WIDTH & PENETRATION

EFFECT OF LEADING ANGLE ON WELD BUILD UP,
WIDTH & PENETRATION

CORRECT CURRENT
 Increasing Amperes – Produces more heat
 Decreasing amperes – Produces less heat

WELDING WITH THE AMPERAGE SET TO
LOW

WELDING WITH TO HIGH AN AMPERAGE

My SMAW NC-II.pptx........................

My SMAW NC-II.pptx........................

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