What Techniques Are Used In TIG Welding A Root Pass?

General
10.04.2014
Back-Purging Techniques, Closure Welding, Tack Welding, TIG welding, Welding Preparation

What Techniques Are Used In TIG Welding A Root Pass?

Many jobs, like nuclear work, piping and consumer goods, require at least the root pass, or the first weld in the pipe joint, to be done with the process of TIG welding, or tungsten inert gas welding. Root passes use weld filler material to close the root space between the weld faces, and are particularly useful when only one side of the weld is accessible. Follow tips regarding shielding gas, welding preparation and weld techniques make TIG welding your root pass successful.

Back-Purging Techniques

Purge the weld zone with argon at about 40 cubic feet per hour. Without adequate shielding, welding defects like incomplete penetration, root pass cracking, root pass suck-back and lack of fusion can occur. There are two common methods for back purging a pipe root pass weld zone: purging the whole volume of a long pipe run or locally purging the immediate volume around the weld zone. A ratio of about 4:1 between the back flow purge rate and the welding torch flow rate is needed to make a sound root pass weld.

Welding Preparation

Preparation of the pipe ends is very important in root pass welding. Clean the pipes to bright, shiny metal for a distance of about 1 inch form the weld preparation edge, then thoroughly clean and degrease the whole area. Also, you need to get the proper fit of the pipes that you are welding. The root gap should be at least 1/32 inches larger than the diameter of filler wire being used to weld. This will allow for the manipulation of filler wire even if some closure occurs during welding.

Tack Welding

Tack welding is necessary to ensure that the pipes do not move during closure welding. Make sufficiently large tack welds and put them often enough around the diameter of the joint so that the filler is smaller in diameter than the root gap. Grinding the tack welds to a feather edge may be helpful. It may prevent small defects that can be detected during radiographic examination from occurring when you make the closure weld.

Closure Welding

When closure welding, keep the joint sealed except in areas being welded. Maintain gas purge pressure for the first two passes to ensure that the root pass will not be tremendously oxidized during subsequent weld passes. Move your torch in a continuous motion from sidewall to sidewall, adding filler wire where the joint as not been tack-welded. Position the filler metal in the root gap opening. This will reduce the possibility of the root gap closing up, limiting weld reinforcement at the root.

While you can very well do all of these techniques and tricks on your own, it would be better that you hire a certified welding company to do the job for you, especially if you have little experience with TIG welding as well as root pass welding. This way, you are assured that you are getting the best possible TIG welding service and products, all for your own convenience and safety.

Reuben Salazar

General
30.01.2014
Advantages Of TIG Welding, https://www.danscertifiedwelding.com/contact-us, TIG welding, TIG welding company

What Are the Advantages Of TIG Welding?

Otherwise known as gas tungsten arc welding or GTAW, tungsten inert gas or TIG welding is a popular welding method where a tungsten electrode, a ceramic cup and inert gas are used to weld metal together. TIG welding offers advantages in terms of amperage and versatility as it uses less energy than other welding methods. A clean weld can be achieved by making a low-profile weld bead, leaving no slag after the welding process is complete. Perhaps the biggest advantage of TIG welding is its control, both in terms of the current and the electrode itself.

Advantages Of TIG Welding

Compared to other welding methods, TIG welding utilizes less amperage. This might seem like a disadvantage at first, but it really helps the TIG welder. When a torch uses a high amperage amount, it is great for thick and large metal bars, but not so good with thin pieces of metal. With a low-amperage torch, the TIG welder can work on thin pieces of metal and all the other kinds of metals that cannot take on high amperages.

TIG welding is considered to be more versatile than the other welding methods. A big part of this is because its lower amperage and foot mechanism allows the welder to change amperage. A welder can go from working on thin pieces of metal to working on thick ones, welding intricate designs together without leaving obvious welding marks. The TIG welder is small, almost similar to a pen, which allows welders to use it for practically any kind of purpose. The inert gas used allows it to work on various metals. Helium is best for copper and stainless steel, argon is best for titanium and steel, and helium and argon combination is best for aluminum and allows that include aluminum.

TIG Welding Leaves A Clean Finished

Some welding methods leave slag once they are finished, so that the finished product looks sloppy. This will also waste time as the welder will have to clean away the slag to make their product or welding job presentable. TIG welding is very clean and will leave no slag at all, so the welder can concentrate on welding instead of cleaning up the metal.

Perhaps the most frequently cited advantage of TIG welding is its control. Amperage and heat are precisely controlled and changed using a foot mechanism. The welding mechanism in itself is pen-like and very thin. So, even when dexterity is needed, the welder will still have superior wedding control. This helps produce high quality welding work, particularly when there are intricate designs and curves in the base metal.

Look For Best TIG Welding Company

When looking to get a welding job done, make sure that you choose the best possible person or company in the business. If you are asking for referrals from acquaintances, it is highly recommended to not stop once you get the name of a company. Do some sleuthing on your own and research the company online. Browse through their workmanship and read reviews from their customers. These should tell you if a TIG welding company is worth shelling out money for.

Reuben Salazar

General
04.01.2014
High Quality TIG Welder, Right TIG Welder, TIG welder

How To Choose A High Quality TIG Welder

TIG welders use an electrical arc to heat the edges of metal surfaces. The edges heat as they connect and they remain firmly connected as they cool. Unlike MIG welders or metal inert gas welders that use a metal wire, TIG (tungsten inert gas) welders directly heat the metal surface.

Importance Of Picking The Ideal TIG Welder

Choosing a quality TIG welder requires that you familiarize yourself with several if the technical aspects of this type of tool. For example, you need to select a quality TIG welder that can weld different types of metals. You should also select a machine capable of working with different types of compressed gas.

Match the metal type you want to weld to the electrical input of the TIG welder. For example, if you need a welder capable of welding hard metals like bronze, cast iron or steel, an alternating current welder should work. AC welders operate using electricity that alternates direction back and forth. If you need to weld soft metals like aluminum you need a direct current welder. Direct current electricity creates a steady arc for the welder and comes from battery cells.
Decide on thickness of the metal that you need to weld. If you need to weld thick metals, you need a welder capable of producing high amperages (amp). Low amperage welders produce 165 to 200 amps while high-amperage welders produce 310 to 700 amps.
Determine if your work location can accommodate your welder. TIG welders weight between40 to 200 pounds, and measure 13 to 36 cubic inches. Different TIG welders also require different plug-ins. Some require a standard 120-volt plug-in while others require a 220-volt plug in.
Compare the duty cycles of the welder. A duty cycle of a welder indicates how long it can operate in a 10-minute interval without overheating. For example, a TIG welder that can weld for weld minutes but is in need of seven minutes downtime to cool off has a duty cycle of 30%. Duty cycles range from 15 to 60%.
Ensure that the TIG welder fits your budget. They cost anywhere from $500 to $2,500, depending on the power.
Compare the features of the TIG welders. They come with various attributes that include high frequency arcs and automatic fans. High frequency arcs help keep the electric current of the welder steady, giving a more precision weld. Pick a welder with as many features as you can afford.
Compare the warranties of the welders. Most manufacturers offer two or three year warranties. There are also retailers that offer a 90-day return policy. In-store return policies can create much less hassle.

It Pays To Choose The Right TIG Welder

Choosing and buying welders can indeed be easier than done. Because of their price tags, they are considered as investments. And because they are investments, you need to make sure that you are getting the most of what you paid for them in the long run. Think about what you and your business really needs, and make them your basis in choosing the best kind of TIG welder for you.

Reuben Salazar

General
21.11.2013
Certified Welding Company, welding, Welding Company

5 Tips In Choosing A Certified Welding Company

When choosing a certified welding company for any kind of project, whether big or small, you need to pick a certified welding company. As potential service provider they should have been certified by organizations that certifies welding companies, welding electrodes, welding inspectors and welding inspection companies. This will ensure that all the welds conducted, including positions, process and joints, are current and approved by the certifying organizations. The following are the most important benefits of choosing a welding company.

Benefits Of Choosing The Certified Welding Company

1. Guaranteed experience — Every certified welding company has both certified welding supervisors and welding inspectors. These people should have completed a course in welding and have at least a year of experience before they are certified. This means that they have the knowledge and experience to company projects safely and in accordance to current standards.

2. Knowledgeable employees — Certified companies have access to course materials along with the latest and best ways to complete welding jobs. This ensures that the professional working on your project knows what he is doing. Certifying organizations also offer seminars and information sessions that will update an employee or the company’s welding knowledge. Every certified company and employee is guaranteed to be up to date with the latest changes to code as well as with welding methods. They will also know about the building codes in your area along with the implemented safety regulations.

3. Liability insurance — If anything goes wrong, certifying organizations requires that all its certified companies carry liability insurance. This should cover you should anything happen to a welding company employee while on your property, or if the job was not correctly completed or has caused damage to your property.

4. Up to standard code — Every job requires a different code of standard for welding, which can differ from small projects likes homes to bigger scale welding projects like office buildings. If a company is certified for a particular code, you should know without any doubt that they know the code inside and out, and meet all your requirements and expectations.

5. Quick and easy tool for choosing a welding company — It is easy to determine if a company is certified or not. A certified welding company will have a badge on their literature which shows what the company is certified for. Also, the website of the certifying organization includes a searchable database of inspectors.

Always Choose A Certified Welding Company

Just like anything else, when choosing for a welding company, it is best to look for one that has been certified by pertinent organizations. When a company is certified, it means that it has taken the time and invested the money to make sure that its welders and employees are up to standard, are safe with their working habits, and have the necessary knowledge and experience to back it all up.

Reuben Salazar

Orbital Welding Is Widely Used In Different Industries

Orbital welding is a specialized kind of welding. Many essential industries used this kind of welding process. Orbital welding virtually replaced the manual type of welding. The process is more favored in highly specialized industries because the results are very neat, much more precise, and it is highly efficient.

The term ‘orbital welding’ pertains to the method of joining tubular objects together. There are several unique challenges when it involves the orbital welding method. It is different as compared to the traditional flat welding because the materials involved are totally different, different tools are required, and the amount of complication in the welding process. It needs a very trained welder to do the job.

Why Orbital Welding Is Different?

Orbital welding tools are distinct in their function and type. In orbital welding, tubes and pipes are put together in order that movement is eliminated. A device referred to as an orbital weld head rotates an electrode within the welded area to make the desired results. Weld heads are readily available in various sizes, styles, and shapes. A different kind of weld head is usually used if there are area restrictions and if there is a particular part to be welded.

If the area has more surface, the more heat is needed to finish a successful weld. Therefore, larger tube and pipe diameters need a great deal of heat and energy to weld. That is why weld heads with a cooling mechanism are very popular by welders. Companies like this cooling feature since it permits for a better work without having discomfort, wear, and much safety.

Orbital welding could sound new to you but there are a variety of functions and comforts that you merely enjoy every day without learning that orbital welding has made it possible. Gas and fluid distribution on your property is a good example that is something not possible without orbital welding. In the construction industry, numerous metals have special challenges when it involves orbital welding. But, a well-trained welder even though it is a difficult material to weld like alloy and alternative precious metals will be handled and effectively welded.

Orbital Welding In Different Industries

Welding a pipe that will be distributed throughout a home or business is offered with utmost importance because it is handling gas products. When safety is jeopardized, it might threaten people and property if the work is not correctly done. Oxygen analyzers are sometimes used to ensure that the oxygen content is low enough to give a weld and in just specific limits so that no likelihood of a gas leak or other malfunction might occur.

The food, dairy and beverage industries need to have orbital welding on all weld joints. Most of their piping equipment has regular schedules for cleaning as well as sterilization. Their piping system should be extremely clean and smooth as possible because any imperfect weld joint can be a placed where bacteria can get in and develop. In pharmaceutical industries they need their piping system to deliver high quality water to be used in their various procedures. This will need orbital welding to ensure a supply of water from the tubes is not infected by bacteria, rust or different impurities.

Reuben Salazar

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Category : General

What Techniques Are Used In TIG Welding A Root Pass?