Repair of 20CrMnSiVaL steel pumping units with the use of welding technologies

Faizullin, A. V.; Файрушин, А. М.; Karetnikov, D. V.; Fatkullin, M. R.

doi:10.17122/ogbus-2014-1-362-376

Cited by 1 publication

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Heat treatment contributes to pearlite transformation and is an effective means to reduce residual stresses and eliminate quenching structures. However, this in turn leads to a noticeable increase in the heat-affected zone (HAZ), which has an adverse effect on the subsequent performance of the machine housings and aggregates [1][2][3][4]. Quite often cracks appear in the HAZ after repairs.…”

Section: Main Partmentioning

confidence: 99%

See 1 more Smart Citation

Development of Technology for Welding Repair of Steel Housings Using a Combination of Ultrasonic Vibrations and Forced Cooling

Fatkullin

Fayrushin

Rizvanov

2020

MSF

View full text Add to dashboard Cite

Now, one of the most pressing issues in the development of petroleum engineering is increasing the efficiency of apparatus and machines, as well as reducing material, energy and labor resources. During operation, oil-refining equipment over time destroyed by welded joints due to the impact of power and temperature loads, corrosion, and other factors. The cause of damage in welded joints of oil and gas equipment can be justified by the occurrence in them of structural heterogeneity and residual stresses during and after welding. Today manual arc welding is almost the only applicable in the repair of equipment for oil and gas processing, which require welding operations. The high temperature source of energy and the difference in deformation properties of parts are the cause of the occurrence of substantial residual stresses, which cause a change in shape, a significant decrease in strength, a decrease in the corrosion resistance of the metal, which adversely affects the durability and reliability of the structure. At present, the technology of repair with due to manual arc welding with the concomitant heating of the defective area and subsequent heat treatment is used. A complex of simultaneously proceeding processes accompanies the welding process: thermal effects on the metal in the heat-affected zone, metallurgical processes in the weld pool and crystallization of the metal in the weld pool. The repair technology presented by us, which consists in a combination of ultrasonic shock vibrations and forced cooling during the welding process, allows to improve the mechanical properties of the welded joint, as well as to refuse to carry out heating during welding and subsequent heat treatment.

show abstract

Section: Main Partmentioning

confidence: 99%

“…To confirm the proposed technology, we produced a real welding sample. We performed a groove on thick-walled steel samples 20HGSFL to simulate the repair of the defective area -sampling and welding of cracks, in accordance with the instructions [1].…”

Section: Main Partmentioning

confidence: 99%