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Post-Processing Welded Parts

20 March, 20 4:52 pm · Leave a comment · Geoff Campbell
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miller proheat 35 liquid cooled on pipe

In welding, like in many other manufacturing and fabrication processes, the process is not complete until the necessary post-processing has been carried out. Post-weld operations are usually performed for reasons such as improving mechanical properties, relieving stress, and improving aesthetics. The two most common Post-weld operations are Post-Weld Heat Treatment (PWHT) and Finishing.

Post-Weld Heat Treatment

During welding, the welded materials are exposed to very high temperatures that can cause micro-structural changes in them. Also, residual stresses build up in welded materials when they are allowed to cool naturally.  If left unaddressed, these stresses and structural changes can severely compromise the mechanical properties of a material and can lead to failure during use. To prevent this, PWHT is required for welded parts. There are two major types of Post-weld heat treatment and they are as follows.
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Welding Quality Assurance & Quality Control Processes

16 December, 19 3:28 pm · Leave a comment · Geoff Campbell
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welding inspection

Quality Assurance

Quality Assurance (QA) is a set of defined processes for systematic monitoring and evaluation to assure product quality.

Quality Control

Quality Control (QC) is the process of confirming that the product meets the specifications. It includes the checking and testing of manufacturing procedures as well as the final products. The results from these tests are compared with a set of defined acceptance criteria. By carrying out QC testing during manufacturing, defects can be identified in a timely manner, allowing for the product flaw to be rectified and if required, adjustments to be made in the manufacturing process to prevent further defective output.

In welding, QA/QC plays a vital role in ensuring sound and reliable welds are produced and in minimizing rework.
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Construction Firm Beats Competition With Fast Induction Heating

31 May, 19 5:22 am · Leave a comment · Colin Brown
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pipeline welding project using induction heat

19 Hours Faster Than the Competition

Texas – One of our customers was trying to heat 42” diameter pipe using pear burners so that welders could weld out the joints. Our team saw an opportunity to create a solution that would help our customer get the job done much more quickly. To make this in-the-field heating job go faster, we put together a package including a Miller ProHeat 35 induction heating system, a 60kVA generator and a DP25 power distribution panel.

Red-D-Arc provided a reliable RDA Induction heating solution to a pipeline construction and maintenance company in Houston who needed to maintain consistent temperatures for their welders to weld out joints from pipes. Our induction heating specialist supplied our customer with a portable induction heating package consisting of a 60 KVA generator, a Miller Pro-Heat 35 induction heating system, and a DP25 power distribution panel. As a cost-effective alternative to their existing propane burners, induction heaters allowed them a secure heating, consistent temperature control, increased weld time, and improved safety.

With this setup we were able to get the pipe up to 250 degrees in about 5 minutes. Our customer was able to beat the competition’s target time by over 19 hours and has been asked to quote on other pipeline work for their client. Needless to say they were pleased with the solution and the opportunity for extra work it created.
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Welder shortage: Key is efficiency, not automation

02 April, 19 1:31 pm · Leave a comment · Colin Brown
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Note: This article first appeared in BIC Magazine

In industry, a growing trend is the idea to use orbital welding as a solution to the mounting problem of welder shortages. It is a well-known fact there are just not enough pipeline welders to go around (no pun intended). By 2020, the American Welding Society expects the U.S. will face a shortage of 290,000 welders. Companies in other business sectors — from food service companies to banks — attempt to solve labor issues and increase efficiencies by utilizing automation to replace workers. Is automation, specifically orbital welding in this case, the way to improve operating factors and productivity?

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Axxair Orbital System Makes Welding Small Pipes Easy

18 October, 18 3:12 pm · Leave a comment · reddarc
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multi pipe welded array
Welding small diameter tubing can be difficult.  The tight radii often require expert welders to deliver precise torch manipulation with finesse.  If the welder is not skilled enough, the out of position areas are at risk of poor quality due to gravity affecting the weld pool and ineffective torch angles.  If out of position welds cannot be completed satisfactorily, the part must be rotated.  However, some assemblies can’t be rotated because of size constraints or they might rotate off of center.  If a mechanized welding solution is desired for small diameter components, look no further than our Axxair Orbital Fusion Closed Welding Head Systems.
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Airgas, an Air Liquide company, is the nation's leading single-source supplier of gases, welding and safety products. Known locally nationwide, our distribution network serves more than one million customers of all sizes with a broad offering of top-quality products and unmatched expertise.