Longmen welding wire feeding hose

The Longmen welding wire feeding hose is the core conveying component of Longmen welding equipment (such as Longmen submerged arc welding and Longmen gas shielded welding), responsible for transporting the welding wire from the wire feeder to the welding gun melt pool in a detailed and stable manner. Its structural design and material selection need to be adapted to the core requirements of Longmen welding for "long-distance, high load, and large-scale welding", which directly affects the consistency of weld formation, welding efficiency, and equipment continuous operation capability. The following is a detailed analysis:

Core classification and adaptation scenarios

According to the wire feeding structure and operational characteristics of gantry equipment, gantry welding wire feeding hoses are mainly divided into two categories, which meet different welding needs in a targeted manner:

Push wire feeding hose:

Structural features: The wire feeder and welding gun are separated, and the welding wire is separately conveyed through a hose. The structure is simple, the cost is low, the maintenance is convenient, and it can be disassembled and replaced at a suitable speed.

Adaptation scenario: Suitable for medium thick plate gantry welding scenarios with welding wire diameter ≥ 1.2mm and hose length ≤ 5m, such as steel structure factory main beam welding, large equipment base splicing, etc., which can meet the stability requirements of conventional long weld welding.

Limitations: The wire feeding resistance increases with length, and uneven wire feeding may occur after exceeding 5m, making it unsuitable for ultra long distance or fine wire welding.

Chain type wire feeding hose:

Structural features: It is composed of several pipe sections with rollers hinged by a pin shaft, and rollers are set around the outer circumference of the pipe sections to replace traditional sliding friction with rolling friction, greatly reducing wire feeding resistance; Strong flexibility, capable of bending into small curvature radii, and an open structure that facilitates the detachment of impurities and is less prone to accumulation and blockage.

Adaptation scenario: Specially designed for long-distance and precision welding of gantry welding, it can adapt to conveying requirements with a length of ≥ 8m, especially suitable for fine wire (≤ 1.0mm) welding or complex trajectory welding, such as large pressure vessel shells, ship deck splicing, etc. It can avoid wire feeding fluctuations caused by long-distance conveying.

Advantages: Good connection strength, large rotational freedom, can be used independently without a jacket, assembly can be automated, and it is suitable for the frequent adjustment of welding positions in gantry welding operations.

Structural design and material selection

The Longmen welding wire feeding hose adopts a "multi-layer collaborative protection+functional layering" structure, which takes into account the stability, performance, and environmental adaptability of long-distance transportation:

Inner layer (guide wire layer): In direct contact with the welding wire, the core requirements are low friction and high wear resistance (based on actual reports), to protect smooth wire feeding without jamming.

Material: The mainstream is reinforced nylon+special resin composite material (with good hardness, friction resistance, suitable for high load welding), carbonized PTFE (with a relatively low friction coefficient to avoid scratching soft welding wires such as aluminum welding wires), and some models have mirror polished inner walls to further reduce friction losses.

Structure: The inner diameter needs to be finely matched with the diameter of the welding wire. For example, 0.8-1.0mm welding wire is suitable for the inner layer of 2.04.0 specification, and 1.2-1.6mm welding wire is suitable for the inner layer of 2.44.7 specification. If it is too large, it may cause the welding wire to tilt, and if it is too small, it will increase resistance.

Middle layer (innovation service layer): Balance rigidity and flexibility, resist deformation and external impact during long-distance transportation.

Material: Traditional models use spiral wound spring steel wire (balancing support and bending), while excellent models use stainless steel wire mesh+elastic resin composite layer (corrosion resistant, strain resistant, suitable for high-frequency bending).

Structure: The wall thickness adopts a uniform innovative service design, which confirms that there is no significant deformation during long-distance transportation, while retaining a certain flexibility for flexible bending when adjusting the position with the gantry welding gun.

Outer layer (protective layer): Resists high temperatures, smoke, and splashes in the welding environment, extending its service life.

Material: High temperature resistant (based on actual reports) ceramic coating is selected for high-temperature scenarios (to resist welding arc heat radiation); Choose metal spring tube+wear-resistant (based on actual reports) polyurethane composite layer (to resist splashing impact and equipment friction) for dusty and high impact environments; Choose 304 stainless steel casing for damp or corrosive environments (to isolate water vapor and chemical media).

Features: Surface wear resistance (based on actual reports), impact resistance, able to withstand heavy objects compression and collision in the gantry welding workshop, and not easily deformed or damaged.

Key performance advantages

Long distance wire feeding stability: By using low friction inner layer material and innovative service middle layer structure, it is confirmed that the wire feeding accuracy error is controlled at the micrometer level within a conveying distance of 5-10m, avoiding problems such as welding point deviation and inconsistent forming of long welds.

Strong adaptability to working conditions: The outer protective layer is targeted to resist harsh working conditions such as high temperature, smoke, and impact, while the middle innovative service structure can withstand frequent bending and external compression. It is suitable for the high strength and continuous operation of gantry welding, and is not easily damaged due to environment or operation.

High maintenance convenience: The chain type model adopts an open structure, and impurities can automatically fall off without frequent disassembly and cleaning; The traditional model has a smooth inner wall and can be cleaned of residual debris at a suitable speed by reverse blowing with compressed air, reducing maintenance costs.

Flexible adaptability: It can match various types of welding wires such as carbon steel, stainless steel, aluminum alloy, etc. The interface supports both threaded and quick insert types, and can be tightly connected to mainstream gantry welding wire feeders and welding guns, preventing air leakage and loosening.