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Sanitary Pipe Fitting – Explore Us Today To Obtain More Tips..

We get a lot of questions regarding welding pipe. Whether it’s about welding high-pressure pipe, Round Steel Pipe for food and beverage industries, or pipe for the oil and gas industries, there are a number of common elements we see in pipe welding and fabrication that lead to problems. These include everything from improper shielding gas and drive rolls to picking a MIG gun with too low of an amperage rating. As companies push to train new welders, work with new materials, increase quality and productivity, and improve safety, it is essential to focus on a few of these basic variables within the pipe welding process that could affect these efforts. In this article, we’ll look at 13 of the most common issues we percieve in pipe welding applications and how to resolve them.

1. Forgetting to grind the joint after oxyfuel or plasma cutting

The oxyfuel and plasma cutting processes add a layer of oxide to the cut edge. This oxide layer should be removed prior to welding, because the oxide often features a higher melting point compared to base metal. Once the arc gets hot enough to melt the oxide, it’s too hot for that base metal and can result in burnthrough. The oxides could also remain in the weld and cause porosity, inclusions, insufficient fusion and other defects. It is crucial that welders be sure you grind the joint right down to the parent material just before welding, as well as grind the inside and outside diameters from the pipe to remove these oxides along with other potential contaminants.

2. Cutting corners with cutting

When welders work with materials very likely to distortion as well as the affects of higher heat input, like stainless and aluminum, a bad cut can result in poor fit-up and produce unnecessary gaps. Welders then compensate by putting more filler metal (thus, heat) into the joint to fill it up. This added heat can lead to distortion and, with corrosion-resistant pipe like stainless-steel, is able to reduce the corrosion-resistant qualities from the base metal. It can also result in insufficient penetration or excessive penetration. Poor preparation also contributes to longer weld cycle times, higher consumable costs and potential repairs.

Shops currently using chop saws or band saws to reduce pipe utilized in critical process piping applications should think about buying dedicated orbital pipe cutting equipment to ensure cuts within mere thousandths of an inch from the specified parameters. This precision helps ensure optimum fit-up and keeps the amount of filler and also heat placed into the joint at least.

3. Forgetting to cut out and feather tacks

Tacking is crucial to fit-up, and greatest practices recommend that the welder reduce and feather that tack to ensure the consistency of the final weld. Particularly in shops when a fitter prepares the Centrifugal Urban Water Pipeline then another person welds it, it’s essential that the welder knows just what is in the weld. Tacks left in the joint become consumed through the weld. If you have a defect inside the tack, or if the fitter used the wrong filler metal to tack the joint, there is a risk for defects within the weld. Eliminating and feathering the tacks helps eliminate this potential problem.

4. Preparing a joint for MIG processes is unique compared to Stick welding

Training welders is actually a top priority for a lot of fab shops, and – for better or worse – many welders bring past experiences with them towards the new job. These experiences may be addressed with adequate training, only one common mistake we have seen is welders with Stick experience not finding out how to properly make a joint for wire processes common in pipe fabrication applications. Welders trained traditionally in Stick and TIG welding often prepare the joint having a heavy landing area and wish to keep the gap as narrow as possible. As pipe shops switch to easier, more productive MIG processes including Regulated Metal Deposition (RMD™), we prefer welders take that landing area as a result of a knife’s edge and space the joint at approximately 1/8-inch. This region is wider than those trained in Stick and TIG processes are employed to and can result in several problems: focusing excessive heat in to the edges from the weld, too little penetration and insufficient reinforcement on the inside of the pipe. Shops should train their welders to the details of each application and be sure they understand different weld preparation and operational techniques before they start working.

5. More shielding gas may not be better

Some welders possess a misconception that “more shielding gas is better” and will crank the gas wide open, mistakenly believing they may be providing more protection to the weld. This technique causes a number of problems: wasted shielding gas (resources and price), increased and unnecessary agitation of the weld puddle, as well as a convection effect that sucks oxygen into the weld and can result in porosity. Each station needs to be outfitted with a flow meter and each and every welder should discover how to set and adhere to the recommended flow rates.

6. Buy mixed gas – don’t depend on mixing with flow regulators

We have now seen shops that, for a stainless application that requires 75/25 % argon/helium, setup another tank of argon along with a separate tank of helium and after that count on flow regulators to bleed in the proper quantity of shielding gas. The simple truth is you truly don’t really know what you’re getting in a mix with this method. Buying cylinders of Sawl Ssaw Galvanized Steel Line Pipes from reliable sources, or buying a proper mixer, will ensure you know precisely what you’re shielding your weld with which you’re adhering to proper weld procedures/qualifications.

7. Welding power sources don’t cause porosity

It is not uncommon to acquire a call coming from a customer who says “Hey, I’m getting porosity from your welder.” Plainly, welding power sources don’t cause porosity. We tell welders to recount their steps back from the stage where the porosity began. Welders will usually realize that it began just when a gas cylinder was changed (loose connections, incorrect gas used), a new wire spool was invest, when someone didn’t prep the material properly (oxides contained in the weld), or if the content was contaminated somewhere else along the line. Most of the time the thing is due to an interruption or problem with the gas flow. Tracing back your steps will usually lead dkmfgb the variable that caused the porosity.

Rise Steel consisted of subsidaries of Cangzhou Spiral Steel Pipe Factory, Hebei All Land Steel Pipe Factory, Hebei Yuancheng Steel Pipe Factory, Cangzhou Xinguang Thermal Insulation Pipe Factory .The company is located in Tianjin port, the largest comprehensive port and an important foreign trade port, engaging in the management of steel pipe production nearly 20 years.The company is a high-tech enterprise intigrated with independent production and sales business.We are committed to the concept of “innovation, technology and service”.

Rise Steel consisted of subsidaries of Cangzhou Spiral Steel Pipe Factory, Hebei All Land Steel Pipe Factory, Hebei Yuancheng Steel Pipe Factory, Cangzhou Xinguang Thermal Insulation Pipe Factory .The company is located in Tianjin port, the largest comprehensive port and an important foreign trade port, engaging in the management of steel pipe production nearly 20 years.The company is a high-tech enterprise intigrated with independent production and sales business.We are committed to the concept of “innovation, technology and service”.

Contact Us:
Address: APT. 1202 BLDG. B Kuang Shi Guo Ji Plaza, Tianjin Free Trading Testing Zone (Business Center), Tianjin, China.
Hamer Chen:[email protected]
Eason Gao: [email protected]
Miao lin: [email protected]
Amy Shi: [email protected]
Hamer Chen:+86 18202505824
Eason Gao: +86 18622403335
Miao lin: +86 13251845682
Amy Shi: +86 18630426996

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