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SETTING THE CURRENT IN MIG WELDING MACHINE
MIG Welding Machine, proper safety protection, and one piece of mild steel plate approximately 12 in. (305 mm) long x 1/4 in. (6 mm) thick, you will change current setting and observe the effect on MIG Welding.
On a scale of 0 to 10, set the wire feed speed control dial at 5, or halfway between the low and high setting of the unit. The voltage is also set at a point halfway between the low and high settings. The shielding gas can be CO2, argon, or a mixture. The gas flow should be adjusted to a rate of 35 chf 916 L/min).
Hold the welding gun at a comfortable angle, lower your welding hood, and pull the trigger. As the wire feeds and contacts the pate, the weld will begin. Move the gun slowly along the plate. Note the following welding conditions as the weld progresses: voltage, amperage, weld direction, metal transfer, spatter, molten weld pool size, and penetration.
Reduce the voltage somewhat and make another weld, keeping all other weld variables (travel speed, sickout, direction, amperage) the same. Observe the weld and upon stopping record the results. Repeat this procedure until the voltage has been lowered to the minimum value indicated on the machine. Near the lower end the wire may stick, jump, or simply no longer weld.
Return the voltage indicator to the original starting position and make a short test weld. Stop and compare the results to those first observed. Then slightly increase the voltage setting and make another weld. Repeat the procedure of observing and recording the results as the voltage is increased in steps until the maximum machine capability is obtained. Near the maximum setting the spatter may become excessive if CO2 shielding gas is used. Care must be taken to prevent the wire from fusing to the current tube.
Return the voltage indicator again to the original starting position and make a short test weld. Compare the results observed with those previously obtained.
Lower the wire feed speed setting slightly and uses the same procedure as before. First lower and then raise the voltage through a complete range and record your observations. After a complete set of test results is obtained from this amperage setting, again lower the wire feed speed for a new series of tests. Repeat this procedure until the amperage is at the minimum setting shown o the machine. At low-amperage and high-voltage setting, the wire may tend to pop violently as a result of uncontrolled arc.
Experienced welders will follow a much shorter version of this type of procedure any time they are starting to work on a new machine or testing for a new job. This experiment can be repeated using different types of wire, wire sizes, shielding gas, and weld directions. Turnoff the welding machine and shielding gas and clean up your work area when you are finished welding.
Basic Welding Health Hazards
Welding joins two metal pieces by the use of heat and with or without pressure apply.
Common Welding Processes are:
- Arc Welding Machine
- MIG Welding Machine
- TIG Welding Machine
- Argon Welding Machine
- Welding Rectifier
- Spot Welding Machine
- Plasma Cutting Machine
Health threats by Gases & Fumes
Mainly gases and fumes come from different way:
- Base material and filler material
- Coating and paints
- Shielding gases and their chemical reactions
- Process and different types of consumable used
- Contaminants in the atmosphere
- Wrong welding techniques
Contact of welding gases and fumes may have Short time impact and Long time impact.
Short time Hazards
- Irritate the eyes, nose, chest and respiratory tract.
- Cause coughing, wheezing, shortness of breath, bronchitis, pulmonary edema, and pneumonitis .
- Cause nausea, loss of appetite, vomiting, cramps, and slow digestion.
Long Time Hazards
? Welders may chance a variety of chronic lung problems, including: Bronchitis, asthma, pneumonia, emphysema, pneumoconiosis, decreased lung capacity, silicosis, and siderosis.
Other Health Hazards:
1. Heat exposure
- Skin burns and skin cancer
- May also increased metal stress & blood pressure, and further cause to heart problems, exhaustion, nervousness, and bad temper.
3. Eye damage– More than 5% eye injuries in industries and construction are associated with welding and cutting
- damage to retina
- damage to cornea, resulting in cataracts
- permanent eye damage
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