Water Delivery Pipe – Look At The Recommendations..

We get lots of questions on welding pipe. Whether it’s about welding high-pressure pipe, Erw Steel Pipe/Tube 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. Included in this are 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 important to concentrate on some 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 see 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 to the cut edge. This oxide layer has to be removed prior to welding, as the oxide often features 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 lead to burnthrough. The oxides may also remain in the weld and cause porosity, inclusions, insufficient fusion and other defects. It is essential that welders make sure to grind the joint right down to the parent material prior to welding, in addition to grind the outside and inside diameters from the pipe to remove these oxides as well as other potential contaminants.

2. Cutting corners with cutting

When welders work with materials prone to distortion and also the affects of higher heat input, like stainless and aluminum, a bad cut can lead to 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 lead to 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 used in critical process piping applications should think about buying dedicated orbital pipe cutting equipment to guarantee cuts within mere thousandths of an 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 a minimum.

3. Forgetting to slice out and feather tacks

Tacking is essential to match-up, and finest practices recommend that the welder eliminate and feather that tack to guarantee the consistency of the final weld. Particularly in shops when a fitter prepares the Ssaw Steel Tube and then another person welds it, it’s essential that the welder knows exactly what is within the weld. Tacks left in the joint become consumed through the weld. When there is a defect within the tack, or maybe the fitter used a bad filler metal to tack the joint, you will find a risk for defects in the weld. Cutting out and feathering the tacks helps eliminate this potential problem.

4. Preparing a joint for MIG processes is unique than with 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 to the new job. These experiences can be addressed with adequate training, but one common mistake we have seen is welders with Stick experience not understanding 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 using a heavy landing area and would like to keep the gap as narrow as you can. As pipe shops transition to easier, more productive MIG processes such as 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 region is wider compared to those trained in Stick and TIG processes are used to and can lead to a number of problems: focusing a lot of heat into the edges in the weld, an absence of penetration and insufficient reinforcement on the inside of 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 go to work.

5. More shielding gas is not always better

Some welders use a misconception that “more shielding gas is better” and definately will crank the gas wide open, mistakenly believing they are providing more protection to the weld. This technique causes a number of problems: wasted shielding gas (resources and cost), increased and unnecessary agitation in 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 using 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, to get a stainless application that needs 75/25 % argon/helium, set up a different tank of argon and a separate tank of helium and then depend on flow regulators to bleed within the proper quantity of shielding gas. The reality is you truly don’t know what you’re getting in a mix using this method. Buying cylinders of Steel Pipe For Building Material from reliable sources, or buying a proper mixer, will ensure you understand 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 obtain a call from the 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 point where the porosity began. Welders will frequently realize that it began just when a gas cylinder was changed (loose connections, incorrect gas used), a brand new wire spool was put in, when someone didn’t prep the content properly (oxides found in the weld), or maybe the fabric was contaminated elsewhere across the line. Usually 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:sales0@rise-steel.com
Eason Gao: sales1@rise-steel.com
Miao lin: sales2@rise-steel.com
Amy Shi: sales5@rise-steel.com
Hamer Chen:+86 18202505824
Eason Gao: +86 18622403335
Miao lin: +86 13251845682
Amy Shi: +86 18630426996

Leave a Reply

Your email address will not be published. Required fields are marked *