3pe Coating Pipe – What Precisely A Number Of People Are Saying..

We get a lot of questions on welding pipe. Whether it’s about welding high-pressure pipe, 2pe Anticorrosion 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. Such as anything from improper shielding gas and drive rolls to selecting 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, you should give attention to a few of these basic variables in the pipe welding method that could affect these efforts. In the following paragraphs, we’ll look at 13 of the most common issues we see in pipe welding applications and how to resolve them.

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

Both the oxyfuel and plasma cutting processes give a layer of oxide towards the cut edge. This oxide layer should be removed prior to welding, since the oxide often includes a higher melting point than the base metal. After the arc gets hot enough to melt the oxide, it’s too hot for your base metal and can result in burnthrough. The oxides may also stay in the weld and cause porosity, inclusions, absence of fusion as well as other defects. It is crucial that welders remember to grind the joint as a result of the parent material prior to welding, along with grind the outside and inside diameters of the pipe to get rid of these oxides along with other potential contaminants.

2. Cutting corners with cutting

When welders work together with materials more prone to distortion as well as the affects of higher heat input, like stainless-steel and aluminum, a bad cut can cause poor fit-up and make 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 may also result in lack of 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 an inch in the specified parameters. This precision helps ensure optimum fit-up and keeps the quantity of filler as well as heat placed into the joint at the very least.

3. Forgetting to slice out and feather tacks

Tacking is critical to match-up, and greatest practices recommend that the welder eliminate and feather that tack to ensure the consistency in the final weld. Particularly in shops when a fitter prepares the Carbon Steel Pipe X60 and then another person welds it, it’s important that the welder knows precisely what is in the weld. Tacks left inside the joint become consumed from the weld. When there is a defect within the tack, or if perhaps the fitter used the incorrect filler metal to tack the joint, you will find 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 really a main concern for many 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, but one common mistake we see is welders with Stick experience not finding out how to properly 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 switch over to easier, more productive MIG processes including Regulated Metal Deposition (RMD™), we prefer welders take that landing area down to a knife’s edge and space the joint at approximately 1/8-inch. This area is wider than those trained in Stick and TIG processes are used to and can result in numerous problems: focusing a lot of heat into the edges from the weld, too little penetration and insufficient reinforcement on the inside the pipe. Shops should train their welders for the specifics of each application and ensure they understand different weld preparation and operational techniques before they go to work.

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 are providing more protection towards the weld. This technique causes several problems: wasted shielding gas (resources and expense), increased and unnecessary agitation from the weld puddle, and a convection effect that sucks oxygen in to the weld and can cause porosity. Each station ought to be outfitted having a flow meter and each and every welder should understand how to set and follow the recommended flow rates.

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

We have seen shops that, for a stainless-steel application that requires 75/25 % argon/helium, create a different tank of argon along with a separate tank of helium and after that rely on flow regulators to bleed inside the proper level of shielding gas. The reality 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 investing in a proper mixer, will ensure you already know exactly what you’re shielding your weld with and this you’re sticking with proper weld procedures/qualifications.

7. Welding power sources don’t cause porosity

It is really not uncommon to get a call from a customer who says “Hey, I’m getting porosity out of 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 often find that it began just each time a gas cylinder was changed (loose connections, incorrect gas used), a new wire spool was devote, when someone didn’t prep the content properly (oxides contained in the weld), or if perhaps the fabric was contaminated someplace else over the line. Most of the time the issue is caused by 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