6 Single choice Pre treatmentWhat kind of treatment should be done at the welding conductor during w

20.Which gas is usually used to purge a<> before or during stainless steel welding operations?

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Before or during stainless steel welding operations, a high-purity inert gas is usually used for purging. The stainless steel welded pipe tee automatic welding machine is penetrating, which means that the weld enters the inner diameter of the pipe and forms a structural joint. This type of weld has a smooth surface that can come into contact with any product, is simple to clean, and has no crack fluids or oxide layers that can harbor and other contaminants.

To achieve hygienic design and compliance with standards and regulations, all food contact surfaces should: smooth, impermeable, crack-free, and crevice-non-porous, non-absorbent, non-contaminating, inert, corrosion-resistant, maintenance-free, and cleanable. When you create a hygienic weld with stainless steel pipe or base buried pipe, it is essential to purge the weld with a high-purity inert gas to remove harmful gases released and accumulated during the welding process that would otherwise cause discoloration, contamination, and oxidation.

The next step in creating a hygienic weld is inspection. Borescopes are used to verify that the weld is penetrating and to identify any defects or contamination. Other non-destructive testing methods can also be employed.

Welding defects include non-fusion with the base metal, cracking of the root weld bead, and lack of penetration. Stainless Steel Welded Pipe Tee Automatic Welding Machine Weld Type: Automatic TIG Welding Hygienic Application The welding specification for austenitic stainless steel pipes and piping systems stipulates that all hygienic welds of austenitic stainless steel pipes and pipes should be completed using the tungsten gas shielded welding process.

Sanitary Stainless Steel Pipe Tee Automatic Welding Machine The automatic argon arc welding process, also known as tungsten electrode inert gas welding, is a clean, high-quality welding process that is usually used when precision welding is required. Automated welding is superior to other processes because it provides greater precision in terms of heat input to the weld area, resulting in a higher quality weld with a smaller heat-affected zone. The automated TIG welding process works by creating an arc between the non-consumable tungsten electrode and the metal part to be welded.

An inert gas, usually argon, is used to protect tungsten rods from oxidation or contamination during the process. Automatic TIG welding is suitable for most metals, including stainless steel, and requires little or no finishing to produce high-quality welds.

Explain the safety management regulations of welding operations, and use precautions in actual operation.

Hello dear! Explain the safety management regulations of welding operations, and use precautions in actual operation (1) Before welding, the welding machine equipment and tools should be checked to see if they are safe, such as whether the welding machine is grounded and the contact between the wiring points is good, and whether the insulation jacket of the welding cable is damaged, etc. (2) Before welding on the equipment, the grounding or zero line of the equipment should be removed, and the reed Zheng should be restored after welding (3) Before the welding operation, the operating environment should be checked, and the harmful factors of danger should be removed and guardians should be set up. When there are other personnel and related facilities nearby, screen protection and safety intervals should be used to ensure the safety of operation.

When welding at height, the seat belt must be fastened. (4) When replacing the welding rod, the welder should carry insulating gloves (5) When welding in metal containers, metal structures and other narrow workplaces, the risk of electric shock is the greatest, and special protective measures must be taken. If rubber pads are used, leather gloves are used, and shoes are worn to ensure the insulation between the welder's body and the weldment.

It is forbidden to use simple welding tongs without insulated housing. (6) When changing the joint of the welding machine and replacing the weldment needs to be reconnected to the secondary circuit, the working place should be transferred, the welding machine should be overhauled and suspended, or the operation should be carried out. (7) The welding machine should be set up in a rainproof and well-ventilated place.

Flammable and explosive materials are not allowed to be stacked at the welding site (8) The power cord on the primary side of the AC welding machine must be well insulated, and shall not be dragged anywhere, the length shall not be greater than 5m, and a protective cover must be set at the incoming line. Dear, <>

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Answer]: Yunzhou A, C

The work document followed by the welder is the guiding document in the process of welding and joint operation, the B welding process qualification report is the technical analysis of the welding before the operation, and the DE is the heat treatment and inspection of the weld after the operation, AC is correct.

Answer] :d, e

The welding work instruction and welding process card are based on the welding process report, and are the operational documents for guiding welders to weld. The welding process instruction and the welding process qualification section are the basis for specimen preparation, welding, weld inspection (heat treatment), sampling processing, and inspection test, while the welding evaluation power of attorney is only the entrustment document of welding evaluation, not a technical document. Therefore, DE should be selected for this question.

Before welding operations, the welding machine and wiring should be inspected in accordance with the requirements of () and so on.

a.The welding machine should be equipped with a good isolation and protection device.

b.The insulation resistance of the welding machine shall not be greater than 4

c.It is strictly forbidden to put the welding machine wire on the flammable tape and explosive equipment.

d.The wiring of the welded reed machine should meet the fire protection requirements.

e.The welding wire and the welding machine should be crimped tightly.

Correct answer: acde