Tuesday, August 19, 2008

Disadvantages of GTAW Welding

1.) Slower travel speed
2.) Lower filler metal deposition rate
3.) Hnad-eye coordination is a required skill
4.) Brughter UV rays than othe processes
5.) Equipment cost can be higher than other processes
6.) Concentrations of shielding gas may build up and displace oxygen when welding in confined areas - ventilate the area and/or use local forced ventilation at the arc to remove welding fumes and gases. If ventilation is poor, wear an approved air-supplied respirator

Monday, August 18, 2008

Advantages of GTAW Welding

Advantages of GTAW Welding
1.) Concentrated Arc - Permits pin point control of heat input to the workpiece resulting in a narrow heat affected zone.
2.) No Slag - No requirements for flux with this process; therefore no slag to obscure welder's vision of the molten weld pool
3.) No sparks or spatter - No transfer of metal across the arc. No molten globules of spatter to contend with and no sparks produced if material being welded is free of contaminants.
4.) Little smoke or fumes - Compared to other arc welding processes like SMAW or FCAW, few fumes are produced. However, the base metals being welded may contain coating or elements such as leas, zinc, copper, nickel and so on, that may produce hazardous fumes. Keep your head and helmet out of the fumes rising off the workpiece. Be sure that proper ventilation is supplied, especially in the confined space.
5.) Welds more metals and metal alloys than any other process.
6.) Good for welding thin material.

NEXT TOPIC: Disadvantages of GTAW Welding

Sunday, August 17, 2008

Principles of Gas Tungsten Arc Welding (GTAW)

Gas Tungsten Arc Welding (GTAW), also known as Tungsten Inert Gas (TIG) welding is a process that produces an electric arc maintained between a non-consumable tungsten electrode and the part to be welded. The heat-affected xone, the molten metal and the tungsten electrode are all shielded from atmospheric contamination by a blanket of inert gas fed through the GTAW torvh. Inert gas (usually Argon) is inactive or deficient in active chemical properties. The shielding gas serves to blanket the weld and esclude active properties in the sorrounding air. Inert gases such as Argon and Helium do not chemically react or combine with other gases. They pose no odor and are transparent, permitting the welder maximum visibility of the arc. In some instances Hydrogen gas may be added to enhance travel speeds.
The GTAW process can produce temperatures of up to 35,000 degrees F (19,426 degrees C). The torch contributes heat only to the workpiece. If filler metal is required to make the weld, it may be added manually in the same manner as it is added in the oxyacetylene welding process.
GTAW is used to weld stainless steel, nickel alloys such as Monel and Inconel, titanium, aluminum, magnesium, copper, brass, bronze and even gold. GTAW can also weld dissimilar metals to one another such as copper to brass and stainless to mild steel.



Protect yourself and others from injury!!!!

1.) Electric shock can kill
2.) Hot parts can cause severe burns
3.) Fumes and gases can be hazardous
4.) Arc rays can burn eyes and skin
5.) Welding can cause fire or explosion
6.) Flying metal or dirt can injure eyes
7.) Build-up of gas can injure or kill
8.) Magnetic fields can affect implanted medical devices
9.) Noise can damage hearing
10.) Cylinders can explode if damaged

Monday, August 4, 2008

Saudi Arabia needs Welding Inspectors

This is an excerpt from www.workabroad.com.ph


POEA License No. : 025-LB-020107-R
Address : Rm. 505 L&SBldg., 1414 Roxas Blvd., Ermita Manila
Tel. No. : 536-6004

6 Welding Inspectors
Work Site: Dammam, Saudi Arabia

Opening Date: Aug 2, 2008 Closing Date: Nov 2, 2008
For Manpower Pooling Only. No Fees shall be collected from the Applicant.

Prospective Principal/Project AL-ARABI STEEL FACTORY
Proposed Salary Very Good Salary Package plus other benefits
Qualifications Gender : Male
Age : 25 - 45 yrs old
Education : At least Bachelor's / College Degree
Yrs. of Experience : 2 yr(s)

Skills Required:

Graduate of Mechanical / Electrical or Civil Engineering course, knowledge in codes & standards & certification in (ASNT-TCIA) level II or III.
Other Details:


Apply personally if you are interested and qualified!!!

Next Welding Inspector's Course

The next Welding Inspector's Course will be conducted on December 15-19, 2008 at Heats Training Room, Carangian, Tarlac City. The course shall be run by a Sr. Welding Inspector.

If you are interested, please contact us at pwtc_luzon@yahoo.com

So, what are you waiting for? Come and join us!!!!