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Posted on November 1, 2018 in NFL Personal Injury

We get plenty of questions on welding pipe. Whether it’s about welding high-pressure pipe, Spiral Carbon 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 which lead to problems. These include from improper shielding gas and drive rolls to choosing 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 important to give attention to a few of these basic variables within the pipe welding process that can affect these efforts. In this post, 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

Both oxyfuel and plasma cutting processes put in a layer of oxide towards the cut edge. This oxide layer has to be removed before welding, because the oxide often includes a higher melting point compared to the base metal. After the arc gets hot enough to melt the oxide, it’s too hot for the base metal and can lead to burnthrough. The oxides can also remain in the weld and cause porosity, inclusions, insufficient fusion along with other defects. It is essential that welders be sure you grind the joint right down to the parent material just before welding, in addition to grind the in and out of diameters in the pipe to get rid of these oxides as well as other potential contaminants.

2. Cutting corners with cutting

When welders assist materials very likely to distortion as well as the affects of higher heat input, such as stainless and aluminum, a poor cut can lead to poor fit-up and create unnecessary gaps. Welders then compensate by putting more filler metal (thus, heat) to the joint to fill it up. This added heat can cause distortion and, with corrosion-resistant pipe like stainless steel, can reduce the corrosion-resistant qualities in the base metal. Additionally, it may lead to absence of penetration or excessive penetration. Poor preparation also leads to longer weld cycle times, higher consumable costs and potential repairs.

Shops currently using chop saws or band saws to cut pipe found in critical process piping applications should look into buying dedicated orbital pipe cutting equipment to guarantee cuts within mere thousandths of the inch in the specified parameters. This precision helps ensure optimum fit-up and keeps the volume of filler as well as heat placed into the joint at least.

3. Forgetting to reduce out and feather tacks

Tacking is essential to match-up, and best practices suggest that the welder eliminate and feather that tack to guarantee the consistency from the final weld. Particularly in shops when a fitter prepares the High Quality Steel Welded Pipe and after that someone else welds it, it’s essential that the welder knows exactly what is within the weld. Tacks left inside the joint become consumed from the weld. If you have a defect inside the tack, or if the fitter used the incorrect filler metal to tack the joint, there is a risk for defects in the weld. Eliminating and feathering the tacks helps eliminate this potential problem.

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

Training welders is a main priority for a lot of fab shops, and – for better or worse – many welders bring past experiences along with them towards the new job. These experiences may be addressed with adequate training, but one common mistake we percieve is welders with Stick experience not understanding how to correctly create 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 want to keep the gap as narrow as possible. As pipe shops transition to easier, more productive MIG processes like 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 utilized to and can cause several problems: focusing too much heat to the edges in the weld, a lack of penetration and insufficient reinforcement on the inside of the pipe. Shops should train their welders to the details of each application and make sure they understand different weld preparation and operational techniques before they go to work.

5. More shielding gas might not be better

Some welders possess a misconception that “more shielding gas is better” and definately will crank the gas wide open, mistakenly believing these are providing more protection to the weld. This technique causes several problems: wasted shielding gas (resources and cost), increased and unnecessary agitation in the weld puddle, and a convection effect that sucks oxygen to the weld and can lead to porosity. Each station should be outfitted using a flow meter and each and every welder should discover how to set and follow the recommended flow rates.

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

We have now seen shops that, for a stainless application that requires 75/25 percent argon/helium, create a separate tank of argon along with a separate tank of helium and then depend on flow regulators to bleed in the proper amount of shielding gas. The simple truth is you actually don’t understand what you’re getting in a mix using this method. Buying cylinders of Stainless Steel Pipe from reliable sources, or purchasing a proper mixer, will guarantee you understand exactly what you’re shielding your weld with and that you’re sticking with proper weld procedures/qualifications.

7. Welding power sources don’t cause porosity

It is not uncommon to acquire a call from the customer who says “Hey, I’m getting porosity from the 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 find that it began just whenever a gas cylinder was changed (loose connections, incorrect gas used), a whole new wire spool was put in, when someone didn’t prep the fabric properly (oxides contained in the weld), or if perhaps the content was contaminated someplace else across the line. More often than not the thing is caused by an interruption or trouble with the gas flow. Tracing back your steps will often 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