Archive for the ‘Tig Welding’ Category
Wednesday, February 1st, 2012
There are two basic ways to control the amps. The first is with the foot pedal which allows infinite control of amps real time. Though this sounds ideal, it is not a very scientific or controlled way of welding if the protocol for welding a particular joint, or metal type defines a narrow range of amps in which the weld should be conducted. The 2T/4T setting allows the operator to start the weld simply by pressing a trigger or switch located on the torch and use pre-settable features such as starting amps, up slope, down slope, and ending amps to manage the weld from beginning to end. Using the 2T function, the 2T normally indicates a press and hold type of operation of the welder. While the switch is held down, it cycles the preset programming automatically. This works well for some situations that require very little thought or skill. The 4T breaks this cycle up to allow manual initiation of each stage of the arc cycle. Pressing and holding the switch usually starts the arc. Releasing the switch will increase the amps to normal welding amps at the rate selected by the upslope. Pressing once again, will cause amps to begin to decrease according to the pre-set down slope until it reaches the final current, which is used to fill the crater so it won’t crack. Then, the switch is released to terminate the arc. Though this isn’t for everyone, 2T/4T does work well for most other countries in the world. A foot pedal is seldom seen outside of most US based welding shops.
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Tuesday, January 31st, 2012
Besides pulse, one of the most important adjustable features on a welder like the Everlast PowerTig series, or the Miller Dynasty series, is the adjustability of the AC frequency, and the AC balance. Both play their part in getting the most out of a AC arc while TIG welding.
AC frequency has been covered before. However, many people fail to realize just how important this feature is, especially if they have never used an inverter with features like this before. Standard transformer welders don’t have any choice but to operate on the same frequency that is supplied to the welding machine through its primary transformer. In the US, that is 60 hertz. Though that is adequate for many welds made in aluminum, it is far from ideal. A more ideal setting would be twice that at 120Hz. This level focuses the arc cone, and improves arc stability. Inverters excel in this because the frequency is generated by electronic components rather than the input power line.
AC balance gives a choice between penetration, and cleaning. Older transformer TIG welders have pretty much the input power line balance of 50/50 ratio between Electrode Negative and Electrode Positive. This offers typically more “cleaning” than is required to break up the oxide layer on aluminum. And it also overheats the tungsten, creating a molten ball on the tip of the tungsten, destabilizing the arc. A sharp tip can be maintained while increasing the penetration of the welder with just a 20-30 percent setting of Electrode Positive. Again, inverters open up the possibilities here by offering adjustable balances. Even when times call for it, inverters like the Everlast PowerTig series can operate at nearly 90% or more of full electrode positive, creating huge amounts of cleaning. Though that is unusual, and a little harsh to weld with, it is nice to know you have that adjustability at your finger tips.
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Monday, January 30th, 2012
Pulse is more than just a setting you make or switch you flip on the machine. Though some “simple” machines may only have an adjustment for pulse frequency, there are other components to the pulse cycle that can be made with most welders. The appropriate terminology for pulse settings is not clearly standardized. This is mainly because of gaps in welding terminology and difficult terminology used by electronic engineers to technically describe what s happening. It is also because of differences in function between brands of each feature Pulse Amps, or Peak Current is used to establish a “high” current setting on some welders. On welders that use a ratio, or percent scale, this is actually a “dip” in current and is sometimes referred to as background current, or even base amps. In a welder that uses a fixed amps setting you will typically see base amps/ current, and Peak amps/ current used. In ratio controlled pulses where percentage of another current is used, this will often be listed as Main welding amps/Peak amps, and Pulse Amps/ base amps/ background current.
Next you will typically see a setting for Pulse width, Pulse Balance or Pulse time on. This is sometimes referred to as pulse duty cycle, but is often avoided because of the confusing terms involved with actual welder operation times referred to as duty cycle. The length of each stage of the pulse cycle is controlled by setting this function. It means that you can make the high amp stage of the pulse cycle longer or shorter than the low amps stage of the pulse cycle. Each half cycle doesn’t have to be balanced…it can be skewed to achieve the best result between melting and freezing. Even though the pulse is happening several times a second, each half phase of the pulse can be metered to give optimum results.
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Friday, January 27th, 2012
A lot of experienced TIG veterans weld all their life and never get to experience TIG welder with a pulse feature. The ones that are fortunate enough to try a TIG, say an inverter TIG like an Everlast PowerTIG, with Pulse, wonder how they could have done it so long without it. Pulse offers improved heat control over the weld, without sacrificing penetration, or speed. It is particularly useful in welding thin metals or edges of seams where the heat may wick over into the shoulder of the metal destroying the edge of a joint. It can also be used to create that stack of dimes look that all welders dream of, by allowing the operator to time the “dips” of the filler metal, according to the rate of the pulse. A slow rate of pulse can make a novice look like a pro in short order because of the dips will make an evenly spaced bead.
Most simply defined, pulse is a rapid oscillation between two pre-selected amp levels, one consisting of a high amp value and one consisting of a lower amp value. The high amp values represent a “penetrating” phase of the pulse, and the low amp value represents a cooling stage of the pulse, in which little or no melting of the parent metal occurs. The high amp portion of the pulse is when the filler rod should be added. The low amp portion of the pulse is the portion of the pulse when the torch should be moved forward. One complete cycle between high and low amp level in one second is one Hertz, or one pulse per second (pps). The frequency of most of these units is adjustable. The adjustability of the pulse frequency is important as well in the width of the arc cone. The faster the pulse the more narrow and constricted the arc becomes allow it to be pointed into tight corners.
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Friday, January 20th, 2012
If you have ever struggled with arc stability while TIG welding, particularly in the lower range of amps that are suitable for the size tungsten, it likely can be attributed to improper grinding. Knowing how much point, and direction of grinding is key. In general, for all DC welding a sharp point is a good choice with a taper at least 2.5 times longer than the Tungsten is wide at lower amps. The same proportion should be used for higher amp range as well. However, to prevent issues with thorium spikes (with thoriated tungsten), and to reduce the risk of contaminating the weld, the point should by slightly snubbed, truncating the end, ever so slightly. This is good advice for DC welding with either an inverter or a transformer welder. However, for AC, the pure, green tipped tungsten that is used in a transformer will not usually be used sharp. Instead it will be balled from a flat tip, or a slightly ground tip. For an inverter, the same tungsten type and grinding can be used for AC as for DC, because of the capability to adjust the AC balance to a point that does not heat the tungsten to a molten ball. In these cases pure (green) tungsten will not be used. Whether it’s a transformer welder or an inverter, it is always critical to grind the point on a dedicated grinding wheel only used to dress the points on Tungsten to prevent contamination of the point. While grinding the tip should be ground along the length, and not radially. The fine striations that are made if radially ground around the circumference can create points of arc instability, making the arc hunt around the surface of the point.
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Tuesday, January 10th, 2012
Aluminum is generally a low density metallic substance. It is also a very good conductor of heat and electricity. Owing to its versatile and comprehensive characteristics, aluminum is widely used in several applications and fields. However, the true potential and benefits of using aluminum for manufacturing purposes can be achieved only when aluminum is combined with other metals to form alloys.
There are several ways to weld aluminum at present in the welding industry. However, the most suitable and best practical method to weld aluminum is to make use of (Tungsten Inert Gas) TIG welding technique. Considering the fact that most rudimentary TIG welders are highly expensive, you might be tempted to make use of other techniques for welding aluminum. However, TIG welder guarantees high efficient results, safer experience, easy to install and use method, and hence serves to be as the most efficient tool, especially for welding aluminum. See to that, you make use of argon gas which is totally inert. Also you cannot use the gas tank employed by MIG welder in TIG welding.
TIG welder also provides higher amperage which is essential for greater thickness metals to be welded properly. Always make sure to clean the aluminum metal that needs to be welded before starting with the welding process. Failing to do so, aluminum reacts with oxygen to form aluminum oxide which acts as a protective blanket hampering your welding process. Hence it is quite essential that you clean your aluminum metal pieces before working upon it. Clean the metal pieces with stainless steel brush meant specifically for aluminum metal and then wipe it down with acetone preferably or lacquer thinner. Now you are ready to weld aluminum using TIG welder.
Tags: Arc Welder, MIG Welder, plasma cutter, TIG Welder, Welders, welding equipments for lease, Welding forum, welding machine
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Monday, November 14th, 2011
Tungsten inert gas shortly tig is a type of welding which necessitates non-consumable tungsten. To put it in simple it is the process of merging reactive metals such as magnesium and aluminum. The space filler metal is added by hand. Tig welding fabricates clean welds that are of top-notch quality. Tungsten and weld is protected by the shielding gas. It allows welding of more metals than any other welding course of action. Through tig welding you can weld almost all types of metals like copper, stainless steel, bronze, brass, gold, and steel. It lets you to cool down or heat up the weld puddle.
Some of the advantages of tig welding:
This type of welding machine generates high quality welds by fixed control of the heat input through a base petal feature. Lesser measure of filler metal is included to the weld puddle, thereby it lets out little glimmering and spattering. The best part of tig welding is that it does not let out smoke or fumes like any other process. Unless and until the base metal restrains contaminants or elements such as oil, grease or paint. To avoid smoke the base metal shall be cleaned thoroughly before the course of action.
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Friday, September 16th, 2011
The Gas Tungsten Arc Welding (GTAW) process, commonly referred to as TIG, has long been considered a fine art form of welding. As a welding process, TIG welding, requires the most knowledge, practice, patience, and overall skill. Even many professional welders are reluctant to add the GTAW process to their welding repertoire due to the skill level and practice needed to thoroughly master.
GTAW Process
Thanks to many of the reality fabrication and do-it-yourself shows and a sluggish economy, TIG welding has gained in popularity. A lot of people have suddenly found themselves edging toward owning their own business, whether it’s a motorcycle, rod shop, or even machine shop after watching non-stop marathons of their favorite fab show on the Discovery Channel or Speed Channel. One of the first purchases often sought is a TIG welder, as it seems to be the backbone of every DIY show on television, so naturally, it must be the backbone of the new shop. Right? Unfortunately, it’s also the very same purchase that brings the first dose true reality to newest Chopper shop to open its doors. It seems that TIG welding is not as easy to master as it seems. For some, the sheer cost of just getting started buying TIG welding related accessories blows the budget. The disappointment experienced by many not to be able to instantly weld is often a setback to getting the business going. Over the next few blogs, we’ll look at various aspects of TIG welding to offer some guidance and support to the person interested in making their first TIG welder purchase and getting their business off to a successful start.
Tags: TIG Welder, TIG Welders, TIG welding, Tig Welding Machine, tig weldings
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Tuesday, April 12th, 2011
There are two types of electrodes that are used normally during a welding process. This can be a consumable electrode of a non consumable electrode.
Consumable electrodes are the ones that would have significant changes in their structure when they are used. This is to say that these electrodes would be consumed in their use. Non consumable electrodes are the ones that are not consumed during the process of welding.
Some welding processes require a flux coated electrode. These electrodes when used would create a smoke around the weld. This would help to stop the air around the weld. Also a consumable electrode can melt and mix with the weld creating a stronger bond.
Therefore the choice between using a consumable and a non consumable electrode lies between the types of metal that is set up for welding. A consumable electrode can aid in the process of better elimination of impurities.
Tags: TIG welding, welder, welding machines, welding process
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Thursday, March 31st, 2011
Though welding is a process that looks complicated, it only needs patience and basic understanding of few welding rules to master the technique. There are many types of welding process that are carried over but TIG Welding has its own set of uses and advantage that cannot be compensated by any other methods of welding.
TIG welding is a process that offers a lot of control over the welding process. Technically we can say that this is a process that uses a non consumable electrode which is known to be the tungsten electrode. One of the main area where this technique is widely used is in welding process to weld stainless steels as well as few other non ferrous metals like that of aluminium, magnesium in addition to copper.
When it comes to the different types of TIG Welders we can basically divide them into five different types. They are power I-TIG 200, power TIG 200 DX, power TIG 225 LX, power TIG 250 EX and the power TIG 315 DX.
Tags: TIG Welder, TIG welding, welder, welding process
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