Erw Pipe – Reasons To Start Looking More Completely About This Facet..

We receive plenty of questions regarding welding pipe. Whether it’s about welding high-pressure pipe, Electrical Steel Conduit 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 anything 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 essential to focus on a few of these basic variables in the pipe welding process that can affect these efforts. In this article, we’ll look at 13 of the most common issues we percieve in pipe welding applications and the way to resolve them.

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

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

2. Cutting corners with cutting

When welders work together with materials prone to distortion as well as the affects of higher heat input, including stainless and aluminum, a bad cut can result in poor fit-up and create unnecessary gaps. Welders then compensate by putting more filler metal (thus, heat) in to the joint to fill it. This added heat can cause distortion and, with corrosion-resistant pipe like stainless steel, is effective in reducing the corrosion-resistant qualities from the base metal. It can also lead to 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 cut pipe found in critical process piping applications should look into buying dedicated orbital pipe cutting equipment to make sure cuts within mere thousandths of the inch from the specified parameters. This precision helps ensure optimum fit-up and keeps the amount of filler and heat put in the joint at a minimum.

3. Forgetting to reduce out and feather tacks

Tacking is critical to fit-up, and best practices advise that the welder eliminate and feather that tack to be sure the consistency from the final weld. Especially in shops in which a fitter prepares the Seamless Tube and after that another person welds it, it’s essential that the welder knows exactly what is in the weld. Tacks left in the joint become consumed by the weld. If there is a defect within the tack, or if perhaps the fitter used a bad filler metal to tack the joint, there exists a risk for defects in the weld. Removing 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 really a main concern for most fab shops, and – for better or worse – many welders bring past experiences with them towards the new job. These experiences could be addressed with adequate training, but one common mistake we have seen is welders with Stick experience not discovering how to correctly 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 maintain the gap as narrow as possible. As pipe shops switch over to easier, more productive MIG processes like Regulated Metal Deposition (RMD™), we prefer welders take that landing area right down to a knife’s edge and space the joint at approximately 1/8-inch. This region is wider compared to those trained in Stick and TIG processes are employed to and can cause several problems: focusing excessive heat into the edges from the weld, too little penetration and insufficient reinforcement on the within the pipe. Shops should train their welders to the specifics of each application and make sure they understand different weld preparation and operational techniques before they start working.

5. More shielding gas may not be better

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

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

We have seen shops that, for any stainless-steel application that needs 75/25 % argon/helium, create another tank of argon as well as a separate tank of helium and then rely on flow regulators to bleed in the proper quantity of shielding gas. The simple truth is you truly don’t understand what you’re getting in a mix using this method. Buying cylinders of Structural Steel Pipe from reliable sources, or purchasing a proper mixer, will ensure you know precisely what you’re shielding your weld with and this you’re adhering to 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 point where the porosity began. Welders will frequently discover that it began just each time a gas cylinder was changed (loose connections, incorrect gas used), a brand new wire spool was devote, when someone didn’t prep the fabric properly (oxides present in the weld), or if the fabric was contaminated someplace else along the line. Most of the time the problem is caused by an interruption or trouble 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