What is the protective flaw detection tape of butt welding elbow
The so-called butt welding elbow, the steel plate welding elbow is generally said to be a large diameter elbow, the diameter is about DN800 and DN800 or more, the salesperson needs to involve cost calculation when selling the butt welding elbow What are the cost of the head? Let's talk about it separately. The cost of butt welding elbow consists of several important costs such as raw material cost, pressing cost, welding cost and shaping flaw detection. The cost of raw materials is the most important cost, and the current butt welding elbows use ordinary steel plates, that is, steel plates with a thickness difference of about 0.5 mm. There are few head manufacturers. The price of the middle plate is relatively high and the thickness difference is relatively small. The price of the butt welding elbow produced is also relatively high. Generally, this kind of steel plate is used as the butt welding elbow for large-scale projects.
The pressing cost is proportional to the diameter of the butt-welding elbow. The larger the diameter of the butt-welding elbow, the higher the cost of pressing the tablet, because the steel plate of the butt-welding elbow needs to be heated by burning coal, and then put it on the special mold. The upper pressing is finally formed, and the larger the diameter, the larger the mold, and the order quantity of the butt welding elbow with the larger diameter is also very small. The cost of the butt welding elbow is very high. If only one 1820 butt welding elbow is ordered, two sheets need to be heated and the tires need to be loaded. Welding cost is also an important cost in the production of butt welding elbows. Strict butt welding elbows require flaw detection welding, that is, to ensure that % of the weld is defect-free. Shaping is to ensure that the roundness error of the caliber cannot be too large, and the flaw detection is more stringent. The cost calculation of butt welded elbows is basically the ones listed above.
When customers purchase butt welded elbows, elbow manufacturers will ask customers whether they want to guarantee flaw detection and tape before quoting. At this time, customers who do not know much about the elbow industry will be confused and do not know elbow manufacturers. What does it mean? Don't be confused. Now we will explain to you what it means to protect flaw detection and tape film. The so-called protection inspection means that the weld seam of the butt welding elbow you want to purchase needs to be 100% guaranteed to be qualified for inspection, and the belt film means that the inspection film should be issued after the inspection is completed. Then you have to ask, is there a difference? Of course there is a difference. The price of the elbow without inspection and the butt welding with a piece is the lowest, because the inspection and the production of the piece are all expensive, of course, what kind of butt welding is required. The elbow depends on the customer's requirements. Sometimes customers need elbow fittings, install low-pressure water pipes or pipes with low quality requirements, that is, the use of butt-welded elbows only plays a turning role, so it is common Butt welding elbow, if it is used for high pressure or natural gas and oil pipelines, it is necessary to carry out flaw detection welding, and also need to have a piece.
Regardless of whether the customer wants flaw detection welding, for the inspection of butt welded elbows, such as manual welding of butt welded elbow fittings, and elbow fittings with welds, it is definitely not possible to just test by inspection, if the customer's requirements are not too strict , If it is used on some pipes that do not need pressure, and it only plays a turning role, we will also conduct corresponding inspections. If the requirements are strict, let alone, because we pay attention to quality, butt welding elbows are all Large-diameter elbows, but the butt welding elbow fittings are not biased to the wall, because the butt welding elbow fittings are all cut from steel plates and then pressed into shape. The material of the carbon steel butt welding elbow fittings is Q235. This steel pipe It is also the same material. It is impossible to say that the material of the butt welding elbow is 20#.
Previous：What is the nominal pressure of stainless steel flange
Next：Four types of common flange production processes
Next：Four types of common flange production processes
