August 29th, 2008 
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Tack welding is used throughout the welding and fabrication industry. Even the most basic welding jobs at home will require you to do “tack welds”.
Fabrication and welding techniques call for the need of tack welding. Manufactured weldments and components require tack welding to hold assemblies and parts together during initial fit up and measuring.
Tack welding is used in mig welding, tig welding and arc welding. p>
A tack weld is a small weld that is placed in critical positions of a project or work piece to hold it in place, keep it square and stop it from warping out of square.
An example of a tack weld would be if you were making a gate out some steel box section. The first step would be to cut the steel to the required lengths. Then you would lay the four lengths of steel on your workbench or onto the floor. You would then use a square to align the steel into a rectangle and clamp them together.
The tack welds are placed on all four corners so that it is held true and square.
These small tack welds will when you full weld the steel together, prevent the steel frame from twisting and bend out of square a lot more than if you just started fully welding it all up.
Also tack welds are small so that if you make a mistake when you cut and square things up, it is easier to grind away a small tack weld as opposed to a large full weld.
http://www.learn-how-to-weld.com/mig-welding-basics-2.html
Cheers,
Peter Apalais
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30 hours of welding, for one beam to beam connection.
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What is the best way to sell Mig welding supplies to the automotive manufacturers in US?We sell Mig contact tips, liners and nozzles to Robotic and Manual welding manufacturers. Our products are world class in quality and priced excellent. The customers are reluctant to change and the best contact is always difficult to find. Our web site is very technicial and offers feedback options for both Manufacturers and suppliers but finding the motivated staff is hard. Is there a listing of industrial sales reps or manufacturer contacts specific to welding?
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nice weld
the metal isnt dirty enough to affect it. I certified with metal that looked like that
The fabrication of hull of large ships is normally done by panels assembled into blocks then the blocks are assembled into sections of the vessel and finally the sections are joined to form the hull.
First, panels consisting of plates and stiffeners are made. In the fabrication of the panels submerged arc welding is most suitable since most of the welding are made on flat surfaces and these can be done using automatic welding machines. Several of these machines can be run by a single operator
.For the assembly of the blocks however, most of the welding operations are done manually because automatic welding machines may no longer be suitable.
Manual arc welding is also used in the assembly of the blocks to form a section of the vessel and also for welding the sections of the hull together.
My suggestion is that you take one of those 6 week welding courses at the local college.
You just don't start by reading a book.
Now i have an office job, but i have been a welder fitter for 20 years.
Make sure the first thing you buy is a fire extinguisher
Dont hold….!!!!
Hahaha I work at a Sawmill If the welders where I work cleaned all the metal before they welded they wouldnt be welding very much! I see them blast the metal quikly with a torch and then weld away!
The WPS is the specific directions instructing the welder in how to execute the weld. It would specify method (mig, co2, stick, submerged arc, etc.), material for the base metal and the filler metal, directions of travel, position of the weld (horizontal, vertical, angular, etc), voltage, and similar variables.
Any WPS must be qualified to demonstrate that it produces the weld characteristics that are desired. It then becomes the recipe so to speak for each welder to follow.
A WPS is typically written by a person experienced in welding.
very nice hand still
I would like to see that weld cut open and sent to a lab for testing. HE DID NOT EVEN CLEAN THE METAL. Dirty welds have poor penetrations and are set up to fail. People, if you are too lazy to clean the metal, don’t weld.
You'll probably need a formal internship or apprenticeship. Especially in this economy, there's no shortage of experienced workers.
you use what is most comfortable you need to be able to see the puddle of molten metal to make sure you have good penetration and a decent looking bead I prefer a glass #10 and a glass cover plate how ever I'm thinking of buying a self darkening helmet as the price has come down to around $ 50 the auto darkening system has been on the market for about 15-20 years my brother bought one when they first came out and paid about $ 275 but the novelty wore off for him you can get a auto darkening from http://www.harbor freight.com Do not look at the light with out a welding lens as you will burn your eyes out!
Have you guys seen “You Can’t Weld This!”? It’s pretty funny… The guys over at WeldingMart com had it made! Do a youtube search for it
making a triangle is a good technique
you may want to do a search on that (google). That may give u the help u need. Good luck!
Do not use welding glass. It does not protect camera lens at all.
Go to a store and buy appropriate filter even a bigger one and attach it to your camera.
18v with 260 wire… I think you should use less wire, more like 190-210. But that’s just me. Weld would look flatter. Have a nice d@y! =)
get an arc welder that has at least 200 amps dc
a name brand such as lincoln miller etc
practice with the 6013
switch to 7018 for higher strength
mig welds are strong but brittle they will break without warning if overloaded
and yes i know a lot of shops use the mig on everything
but if they see what i see all of the time they wouldn,t
arc welds will usually start cracking before they fail
on the lighter metals you are talking about the mig would be ok or if you plan to do any aluminum welding
but if you want to go to heavier metal later the arc welder is better
most of my welding is done on 3/4 inch or thicker metal
i will use my mig if it is nonstructural
if you think what i say about a mig is not true try fillet welds on 1/4 inch plate then bend them
welding is a physically demanding job, regardless of the type, most of the time you are sitting or standing for long periods of time, but it is also a great trade to have, if your asking about strength, it depends on the job, if you are production welding then you do not need to be very strong, but if you are a welder-fitter you would need alot of strength, because you would be handling material by hand and it can get pretty heavy, basically its up to you to know what type of welding you want to get into, and if you feel that it would be right for you in a physical sense. hope that helps with your question, good luck.