Modulis "Įvadas į Profesiją"

The main cause of deformation is that metal layers heat and expand unevenly, while contracting unevenly when cooled.

The correct answer is "Oro" which means "Air" in Lithuanian. The question is asking what gas is being referred to, and the options given are "Acetylene," "Air," and "Natural gases." Since "Oro" translates to "Air," it is the correct answer.

You want to tell them what will meet their needs, not everything you know.

The correct answer states that welding joints can be categorized based on their position in space. These categories include lower, vertical, horizontal, and overhead joints.

The correct answer provides a classification of carbon steel based on the carbon content. It categorizes carbon steel into three groups: low carbon steel (up to 0.25% C), medium carbon steel (0.25% - 0.6% C), and high carbon steel (above 0.6% C). This classification helps in understanding the properties and uses of different types of carbon steel based on their carbon content.

Dujų reduktoriai yra reikalingi norint mažinti dujų slėgį ir reguliuoti bei palaikyti pastovų darbinį dujų slėgį. Tai ypač svarbu tam, kad dujos būtų saugiai naudojamos ir jų slėgis būtų tinkamai kontroliuojamas. Be to, dujų reduktoriai taip pat gali apsaugoti balionus nuo atbulinių liepsnos smūgių ir padėti nustatyti dujų kiekį balione.

The correct answer is "Pagal elektrodo skersmenį" (According to the electrode diameter). When welding with MMA (Manual Metal Arc) process, the current strength is selected based on the diameter of the electrode being used. Different electrode diameters require different current strengths to ensure proper penetration and weld quality.

Siera (S) yra žalinga priemaiša pliene, nes ji sukelia pažeidimus ir sumažina plieno stiprumą bei tvirtumą. Siera sukelia plienei trapumą ir lengvai sužeidžia plieno struktūrą, dėl ko plieno gaminiai gali būti lengvai sulaužyti arba sugadinti. Todėl siera yra neigiamai vertinama ir siekiama ją kuo labiau sumažinti plieno gamyboje.

The purpose of protective gases is to protect the liquid weld metal from harmful substances present in the atmosphere.

Grūdinimas yra procesas, kuriame plienas kaitinamas iki tam tikros temperatūros ir tada greitai aušinamas. Tai padeda pagerinti plieno savybes, tokiu būdu padidinant jo tvirtumą ir atsparumą. Lėtas aušinimas arba kaitinimas ir aušinimas krosnyje nėra tinkami atsakymai, nes grūdinimo procesas reikalauja greito aušinimo, o ne lėto aušinimo ar krosnyje atliekamo kaitinimo ir aušinimo.

The correct answer is "Ištraukiamoji ir tiekiamoji." In this question, the ventilation required for a welder's workplace is being asked. "Ištraukiamoji ir tiekiamoji" translates to "exhaust and supply" in English. This means that both exhaust ventilation and supply ventilation are necessary for a welder's workplace to ensure proper air circulation and removal of fumes and contaminants.

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The correct answer is "Galingą, ilgalaikį ir stabilų elektros išlydį tarp dviejų elektrodų." This answer describes the characteristics of an arc welding process, where a powerful and stable electric discharge is maintained between two electrodes to create a high-temperature arc that melts and fuses metal.

The correct answer is "Stiprumas, kietumas, tamprumas." These three properties, strength, hardness, and toughness, are mechanical properties of metals and their alloys. Strength refers to the ability of a material to withstand an applied force without breaking or deforming. Hardness is the resistance of a material to indentation or scratching. Toughness is the ability of a material to absorb energy and deform plastically before fracturing. These properties are important in determining the suitability of metals for various applications, such as structural components or tools.

The correct answer is "Tikrinimas tempiant." In quality control, the method of checking by applying tension or force to the object is called "tikrinimas tempiant." This method involves testing the strength and durability of the object by subjecting it to various levels of tension or force to ensure that it meets the required standards.

Bronzė yra vario lydinys su alavu, aliuminiu, siliciumi, manganu, švinu ir beriliu.

The marking "MAG" indicates the semi-automatic welding process in an active gas environment.

Defektai suvirinime gali būti skirstomi į išorinius ir vidinius. Išoriniai defektai yra matomi iš išorės ir gali būti lengvai pastebimi, pavyzdžiui, plyšiai arba įbrėžimai ant suvirinimo paviršiaus. Vidiniai defektai yra nematomūs iš išorės ir gali būti aptikti tik naudojant specialius tyrimo metodus, tokius kaip rentgeno ar ultragarsinės kontrolės. Be to, defektai gali būti skirstomi pagal suvirinimo siūlės plotį ir ilgį, taip pat pagal jų pobūdį ir poveikį suvirinimo sąnariui.

A sandūrinė jungtis refers to when elements are arranged in a single plane.

The question is asking which of the listed options is classified as an internal welding defect. The correct answer is "Poros." Poros refers to the presence of small voids or gas pockets within the welded joint, which can weaken the structure and compromise its integrity. Krateriai (craters) and Įpjovos (notches) are not specific to internal defects and can occur on the surface as well.

The correct answer is "Nuolatine ir kintama srove" which means "DC and AC current" in English. This means that it is possible to weld with both direct current (DC) and alternating current (AC) in an argon gas environment using a non-consumable tungsten electrode.

The correct answer is "The electrode tip is tapered 2D in length." This means that the tip of the electrode is gradually narrowed down to a point over a distance of 2D (twice the electrode diameter). This tapering helps to concentrate the heat at the tip and create a focused arc for more precise and efficient welding.

Anglies dioksidas (CO2) yra naudojamas kaip apsauginė dujų suvirinant MAG būdu. Tai yra dėl to, kad CO2 yra nebranduolinė, inertinė dujos, kuri apsaugo suvirinimo zoną nuo atmosferos deguonių. CO2 taip pat padeda išlaikyti tinkamą temperatūrą suvirinimo metu ir užtikrina geresnį metalo apsaugą nuo oksidacijos.

The correct answer includes the strength of the welded joint, the strength of the heat-affected zone, and the strength of the base metal. These are important factors to consider when evaluating the quality and integrity of a welded connection.

The correct answer is "Į konstrukcinius, įranknius ir specialiuosius plienus." This answer states that steel is divided into three categories based on its purpose: construction, tools, and special steels. This categorization helps to differentiate and classify steel based on its specific applications and properties.

The correct answer is "Mažaanglis plienas" because it is the only option that is a type of steel. The other options are aluminum, copper, ketus (unknown material), and titanium, which are not types of steel.

The correct answer includes all the possible types of electrode coatings based on the predominant materials in their composition, according to ISO. These types include acid (A), basic (B), rutile (R), cellulose (C), thick rutile (RR), acid-rutile (AR), and other (S).

The correct answer is 5000-8000 C. This range represents the temperature of the welding arc. Welding arcs typically reach temperatures between 5000 and 8000 degrees Celsius, which is hot enough to melt and fuse metal together. This high temperature is necessary for the welding process to be effective and create a strong bond between the materials being joined.

The correct answer is "Perkaitimo srityje" (in the overheating zone). This means that the weakest point of the welding seam is in the area where the metal has been overheated. Overheating can lead to structural weaknesses and reduce the overall strength of the weld.

The given answer states that S185, S235JR, C22, C25 are well weldable steels with a carbon equivalent (Cekv) value less than or equal to 0.25. This means that these steels have a low carbon content and are suitable for welding without significant issues such as cracking or distortion. The other steel grades mentioned have either higher carbon content or a higher carbon equivalent value, indicating that they may have poorer weldability compared to the steels mentioned in the answer.