March 27th, 2008 
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Laser welding plastics is a fairly new process. It super heats the polymer without physical contact. Most applications processes are done by, directing the beam of infrared light. Directly at the weld joint. This is done by going through one of the parts. Commonly referred to as, through transmission.
By directing infrared beam of infrared light at the weld joint via( a laser)welding. This technique, the infrared beam, usually a laser, irradiates the joint through a part and the light is absorbed at the surface of the other. While broad band infrared beams can be used, the monochromatic lasers allow very fast heating of small areas of the part that allows the parts to be welded very rapidly, but with very small changes to the geometry part.
Laser welding is a example of electromagnetic plastic welding process. Once radiant energy it has been directed towards polymer surface, a series of three things will happen to it, most of the light transmits through, some is absorbed, and some is reflected away. The application the process involves directing the beam of infrared light towards the weld joint through one of the parts. The part (laser) that transmits most of the energy will not heat, but the absorbing part will super heat .Most virgin, organic polymers will not absorb energy. Certain dyes and fillers such as carbon black are used. To absorb the energy at the weld joint interface. This is commonly called to as through transmission infrared (or laser) welding. Welding results when materials are heated to a molten state and fused together.
One type of material must transmit the laser light while the other absorbs it, While converting it to heat. The great news is that the materials must be transmissive. This all depends on formulation of the pigment. Joints that require optical clarity can be done by the use of special coatings types. Thermoplastics, Laser welding, resin compatibility , resin chemistry or melt temperature differences than most all other plastic welding processes these days.
Nd:YAG laser welding is used commercially, a wide range of C-Mn steels, stainless steels, coated steels, molybdenum, titanium, and aluminum alloys. Low heat input welding. These lasers is utilized in the electronics, domestic items, automotive sectors, the most interest has been shown more recently, to particularly for the high power CW lasers in the shipping industry. Oil and gas, R&D issues involving development of highly powered lasers of better beam quality, the use of distributed energy in the beam focus, maintenance for both thick and thin sections and weld classification.
Light energy is generated by lasers. That can be absorbed into materials and converted to heat energy. Laser emits coherent radiation. Lasers do minimal divergence that can travel over significant distances without loss of beam quality or energy.
Relatively new techniques in Laser welding have been compared to other plastic welding processes. Dedicated laser labs at EWI’s are equipped with lasers creating and analyzing plastics welding. The laser beam used to melt the base material and filler rod, this process becomes line of sight ,as well as focal point limited process. If you cannot get a straight shot, or you can’t re-line the position of the weld area, it will not work efficiently or correctly. Microscopic magnification is also is used in the laser welding process.
The system is capable of welding materials that are galvannealed, electroplated or hot-dipped galvanized, that the coating thickness be both consistent on top of surface of the material, as well as controlled to 14 microns or less. The 3-kW diffusion-cooled slab laser used in the Utica system can be used to weld materials, ie mild steel, high-strength steel, stainless steel, aluminum. The biggest driving factor behind the development of laser welding is the fact that it makes the cans more esthetically attractive.
Beam delivery used optics that are mounted directly on the laser housing and fixed in focal length and beam position relative to the housing. Moveable part concept ,diode lasers mounted on robotics. Multiple-beam processing is new , relatively new field that has the potential. Enhancing the capabilities of high intensity laser and electron beam process.
Post heating, multiple-beam laser preheating is shown, first presented and analyzed. Followed by multiple-beam flow. this application electron beam welding. Other applications using laser machining and cladding. Particles with high melting points were distributed on the plate material in order to see the motions of these particles. And the enclosed motions of the melt pool during welding with different type of process gases. Photos show a change in the melt flow direction ,with active gas components towards the center of the pool and downwards towards the root side.
Watch the video related to welding
How to use car batteries to do emergency welding when out four-wheeling (or any time for that matter.)
Help answer the question about welding
How much do I charge for cutting and welding steel?I have been welding for a while now with a mig/flux core welder and I am pretty good at it. I have been getting a lot of requests from people to do some welding work for them on the side but I have no clue how much I should be charging them. Any ideas on a fair rate?
About Author
Roger Hathaway from Arcor laser is experienced in laser welding and knows the difficulties that arise from meeting the demands of the 21st century manufacturing by utilizing the many benefits realized by laser materials processing.
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the metal isnt dirty enough to affect it. I certified with metal that looked like that
nice weld
making a triangle is a good technique
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
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.
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.
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.
You'll probably need a formal internship or apprenticeship. Especially in this economy, there's no shortage of experienced workers.
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! =)
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.
very nice hand still
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!
Dont hold….!!!!
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.
you may want to do a search on that (google). That may give u the help u need. Good luck!
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
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