【Weekly Topic】Topics on welding
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The term \"welding\" is somewhat specialized. Through the relentless efforts of numerous welding engineers, technicians, and craftsmen, many welding challenges have been overcome in the field of welding technology. However, in practical work, many maintenance workers still understand welding only in terms of melting metals together to bond them. This leads us to this week’s topic: What are some of the more unusual welding methods that your companies have encountered, and what are your thoughts on these methods? If you were given a regular pipe, and if that pipe is too close to the ground with the leak located below it, and the working area isn’t very large, do you think it’s possible to weld it properly? What method do you plan to use for welding? We welcome everyone to actively participate in the discussion! 【Collection of Essential Knowledge for the Mechanical Forum】http://bbs.hcbbs.com/thread-1389197-1-1.html Topics for each week and daily questions are being sought (prizes available for participation) http://bbs.hcbbs.com/thread-1373282-1-1.html Summary post of weekly topics: http://bbs.hcbbs.com/thread-1404940-1-1.html Starting today, the Mechanical Forum is bringing wealth to all its members http://bbs.hcbbs.com/thread-1489563-1-1.html Go and claim your wealth now – the distribution has begun!
The distance from the ground is low; if it’s a small pipe, it can be lifted somehow for processing. For large pipes for which no working space can be created, for low-pressure applications, we used to employ the method of creating a skylight, that is, making an opening right above the hole; after welding the lower part, we would then weld the upper part in place. I won’t talk about high pressure; let’s move on to another topic.
A special welding method is used; in conventional welding, the arc is a free arc, and only a portion of the gas in the arc region is ionized, resulting in insufficient concentration of heat. When a free arc is compressed into an arc with high energy density, the gas in the arc column becomes fully ionized, resulting in a state that contains only positive and negative ions – this is the fourth state of matter: plasma. Plasma arcs feature high temperatures (15,000–30,000 K), high energy density (480 kW/cm2), and fast-moving plasma streams (up to several times the speed of sound).
The distance from the ground is low; if it’s a small pipe, it can be lifted somehow for processing. For large pipes for which no working space can be created, for low-pressure applications, we used to employ the method of creating a skylight, that is, making an opening right above the hole; after welding the lower part, we would then weld the upper part in place
For pressure pipes, replacement is definitely necessary. Obstacle welding can be used with mirrors, but it requires high skills from the welder. Creating a skylight in large pipes is another option
The common welding methods are ordinary electric welding and laser welding. If there are indeed leaks that need to be addressed, it is first necessary to analyze the properties of the medium in question; if it is flammable or explosive, welding it directly is definitely not an option, as it can be fatal. Therefore, each situation must be handled on a case-by-case basis, and it is crucial to first determine what method should be used to address the problem.
If it is not possible to make improvements in the working space – such as lifting the pipes or digging holes in the floor – and mirror welding cannot be used either, then it is necessary to consider using small automatic welding heads that are cost-effective. As a last resort, the pipe section with defects must be cut off, ensuring that the required weld distance is still met; of course, new ring-shaped welds also facilitate welding in all positions. The cut pipes can also be rewelded, pressure-tested, and used as spare parts.
Large pipes: It is possible to consider installing skylights; of course, it is also feasible to allow people to enter, provided that safety is ensured. Small pipes: Welding repairs are not possible – the pipe must be replaced outright. Another option is to use sleeve-type repairs, and welding fillet joints are relatively easier to handle in terms of quality control.
Large pipes: It is possible to consider installing skylights; of course, it is also feasible to allow people to enter, provided that safety is ensured. Small pipes: Welding repairs are not possible – the pipe must be replaced outright. Another option is to use sleeve-type repairs, and welding fillet joints are relatively easier to handle in terms of quality control.