CN104625357A - H-steel or T-steel full-penetration back-gouging-free welding method - Google Patents

Abstract

The invention discloses an H-steel or T-steel full-penetration back-gouging-free welding method. According to the method, a K-shaped groove ranging from 45 degrees to 60 degrees is formed in a web of H-steel or T-steel, a truncated edge with the width ranging from 3 mm to 4 mm is reserved, the H-steel or the T-steel is arranged on a ship-form assembly jig, the web and a flange plate are assembled in a gapless mode, the top end of the web of the T-steel is provided with a locating plate, the included angle between the bottom edge of the ship-form assembly jig and the ground ranges from 20 degrees to 50 degrees, and the web is parallel to the bottom edge of the ship-form assembly jig; the web and the reverse side and the obverse side of a K-shaped groove of the flange plate are subjected to backing welding, single-wire submerged arc welding and double-wire submerged arc welding are adopted, the included angle between a welding wire and the web ranges from 60 degrees to 70 degrees, and welding parameters are set respectively; after backing welding is completed, filling welding and cosmetic welding are conducted, single-wire submerged arc welding and double-wire submerged arc welding are adopted, and welding parameters are set. By means of the H-steel or T-steel full-penetration back-gouging-free welding method, the defects of a traditional back-gouging-free welding method are overcome, the complex back-gouging-free procedure in the welding process is omitted, the welding efficiency is improved, environmental pollution on a working site is avoided, and the full-penetration welding quality is guaranteed.

Description

H profile steel or T-steel full penetration exempt from back chipping welding method

Technical field

The present invention relates to a kind of H profile steel or T-steel full penetration exempts from back chipping welding method.

Background technology

The T-steel of large-scale welding and H profile steel are widely used in the fields such as steel building, boats and ships, mining machinery and heavy-duty machinery, are a kind of important force structures.Usual T-steel and H profile steel are designed to full penetration form, and in traditional T-steel and H profile steel, the welding step of T connector is followed successively by backing welding, fills weldering, back side carbon arc air gouging back chipping, the back side are welded, cosmetic welding.Wherein back side carbon arc air gouging back chipping operation not only expends man-hour and wlding, and in carbon plane process, produces a large amount of flue dust, pernicious gas and the noise up to 90 ~ 120 decibels, severe contamination production on-site environment, affects the healthy of welding personnel.Therefore; exempt from back chipping welding for the employing back side and ensure joint penetration; explore suitable buried arc welding method, thus simplify welding procedure, the material that cuts the waste, improve welding productivity, reduce environmental pollution, welding personnel is healthy is very important in protection.

Chinese Patent Application No.: 201210383572.3 welding methods that application discloses a kind of angle welding not back chipping being called " crane girder slab T-shaped full penetration angle welding unclear welding method ", the method is that 60 degree of K type grooves opened by web, welding wire and wing plate angle 34 degree, do not stay root face, set off with fire-retardant asbestos cord overleaf, coordinated by band steel and magnet and fix asbestos cord, then carry out backing welding and back chipping full penetration is exempted from the back side.Chinese Patent Application No.: 201210407057.4 be called " a kind of H profile steel submerged welding process method of welding web thickness and being greater than 16mm " application discloses one not back chipping full penetration buried arc welding method, the method is that K type 60 degree of grooves opened by web, root face 1 to 2 millimeters, the back side adopts copper billet as liner, first weld first backing welding, before reverse side full penetration, copper lining is knocked out, then weld.

Although above two kinds of buried arc welding methods eliminate back root cleaning when carrying out full penetration, but the back side needs placement to set off or liner before backing welding, making and installing these corresponding liners or set off all needs to spend many man-hours, and need blanking and assembling to meet certain processing request, there is certain difficulty, really can not realize high efficiency welding.

In addition, a kind of carbon dioxide arc welding that application discloses that Chinese Patent Application No. 201210342329.7 is called " H profile steel unclear welding method " exempts from back chipping welding method, the method is the K type groove that web opens 40 degree to 50 degree, root face 0mm to 2mm, adopts the method that two welding guns weld on both sides simultaneously.The method connects although can realize the unclear root bead of full penetration, but because the input of carbon dioxide welding heat is little, for can full penetration be realized, location backing plate must be adopted, needing to stop welding when being welded to location backing plate, on both sides, location backing plate plane being fallen then to weld with carbon arc air gouging again.The shortcoming of the method is to remove carbon plane back chipping completely from, and can not realize continuous backing welding, have impact on the progress of welding, two welding guns move in web both sides simultaneously simultaneously, also higher to equipment requirement.Therefore, be necessary that discussion is a kind of and exempt from the buried arc welding method that back chipping exempts from liner, while realizing high efficiency welding, do not pollute production on-site environment.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of H profile steel and T-steel full penetration exempts from back chipping welding method, this method overcomes the defect that tradition exempts from back chipping welding method, eliminate welding process numerous and diverse exempt from back chipping operation, improve welding efficiency, avoid production on-site environment to pollute, ensure that the welding quality of full penetration.

For solving the problems of the technologies described above, H profile steel of the present invention or T-steel full penetration are exempted from back chipping welding method and are comprised the steps:

The K type groove of 45 ~ 60 degree opened by step one, H profile steel or T-steel web, root face stays 3 ~ 4mm, H profile steel or T-steel are located on ship shape moulding bed, gapless assembled by web and flange plate, the web top of T-steel arranges location-plate, ship shape moulding bed base and ground angle are 20 ~ 50 degree, and web is parallel with ship shape moulding bed base;

Step 2, carry out backing welding in the K type groove front of web and flange plate, front backing welding adopts monofilament submerged-arc welding to weld, and welding wire and web angle are 60 ~ 70 degree, and welding current is 550 ~ 650A, weldingvoltage is 29 ~ 31V, and speed of welding is 300 ~ 450mm/min;

Step 3, the K type groove front backing welding of web and flange plate carries out second fill and weld, second is filled weldering and is adopted double wire hidden arc welding welding, and welding current is 640 ~ 680A, voltage 29 ~ 32V, speed of welding 600 ~ 660mm/min;

Step 4, carry out backing welding at the K type groove back side of web and flange plate, back side backing welding adopts double wire hidden arc welding to weld, and welding wire and web angle are 60 ~ 70 degree, and welding current is 650 ~ 800A, weldingvoltage is 30 ~ 35V, and speed of welding is 400 ~ 500mm/min;

Step 5, the K type groove front backing welding of web and flange plate, second fill weld and back side backing welding complete after carry out filling and weld and cosmetic welding, filling weldering and cosmetic welding all adopt double wire hidden arc welding to weld, welding current is 650 ~ 750A, weldingvoltage is 30 ~ 33V, and speed of welding is 600 ~ 700mm/min.

Exempt from back chipping welding method due to H profile steel of the present invention or T-steel full penetration and have employed technique scheme, namely this method opens the K type groove of 40 ~ 70 degree in H profile steel or T-steel web, root face stays 3 ~ 4mm, H profile steel or T-steel are located on ship shape moulding bed, gapless assembled by web and flange plate, the web top of T-steel arranges location-plate, and ship shape moulding bed base and ground angle are 20 ~ 50 degree, and web is parallel with ship shape moulding bed base; Carry out backing welding at the K type groove front and back of web and flange plate, adopt single double wire hidden arc welding to weld respectively, welding wire and web angle are 60 ~ 70 degree and set welding parameter respectively; Carry out filling weldering and cosmetic welding after backing welding completes, adopt double wire hidden arc welding to carry out welding and setting welding parameter.This method overcomes the defect that tradition exempts from back chipping welding method, eliminate welding process numerous and diverse exempt from back chipping operation, improve welding efficiency, avoid production on-site environment pollute, ensure that the welding quality of full penetration.

Accompanying drawing explanation

Below in conjunction with drawings and embodiments, the present invention is described in further detail:

Fig. 1 is the schematic diagram that in this method, H profile steel or T-steel and ship shape moulding bed are arranged.

Detailed description of the invention

Below with the T-steel of T200 × 400 × 50 × 50mm; material is Q345B; by reference to the accompanying drawings the enforcement of this method is described in further detail: the present embodiment be premised on this method technical scheme under implement; object is only the content better understanding this method, and the protection domain of present patent application is not limited to following embodiment.

See Fig. 1, it is as follows that a kind of H profile steel described in this patent or T-steel full penetration exempt from the operation of back chipping welding method:

A 50 ± 2 degree of K type grooves opened by web 2 by (), root face 3 ~ 4mm is assembled into T-shaped component with flange plate 3, and assembling does not stay gap, use simultaneously and are welded and fixed location-plate 1;

B the T-shaped component assembled is put on ship type moulding bed 6 by (), the angle then adjusting ship type moulding bed and ground 7 is 25 °, ensures that welding wire 5 is 65 ° with the angle of web;

C () selects wlding to be H10Mn2 according to material, diameter is 4.8mm, and the solder flux trade mark is SJ101, and granularity is 10 ~ 60 orders;

D () ground floor backing welding weld seam 4, adopts monofilament submerged arc welding, for occurring burning phenomenon in prevention welding process, less heat input technique is adopted to weld, its welding procedure is: electric current 560 ~ 580A, voltage 30 ~ 31V, speed of welding: 400 ~ 420mm/min;

Second is filled weldering and is adopted double wire hidden arc welding welding, and welding procedure is electric current 650A, voltage 31V, speed of welding 650mm/min.

E () then welds the back side, for realizing exempting from back chipping full penetration, directly adopt comparatively high heat-input technique double wire hidden arc welding to weld, concrete technology is: electric current 720 ~ 740A, voltage 32 ~ 34V, speed of welding 430 ~ 450mm/min.

(f) connect under the two-sided filling weldering of K type groove and cosmetic welding all adopt double wire hidden arc welding to weld, welding procedure is electric current 680 ~ 700A, voltage 30 ~ 32V, speed of welding 600 ~ 660mm/min, fill weldering and can carry out heat treatment again to backing welding, improve material structure.

Through the T-shaped component of said method welding through ultrasonic inspection, reach examination requirements, thus realize improvement to this type of structure manufacture method, reach the object exempting from back chipping.

The mode that this method adopts single mariages to combine at web and the K type groove front and back of flange plate carries out submerged arc welding, eliminate carbon plane back chipping, back side liner or set off and mounting process, eliminate carbon arc rods, decrease the use of grinding disc, improve welding production efficiency, reduce the labour intensity of welding personnel, decrease the consumption of welding material and relative article simultaneously, save welding cost; Especially because noise reduces and reduce the generation of pernicious gas, significantly improve the environment of production scene, achieve the protection healthy to workman.

Claims (1)

1. H profile steel or T-steel full penetration exempt from a back chipping welding method, it is characterized in that this method comprises the steps:

The K type groove of 45 ~ 60 degree opened by step one, H profile steel or T-steel web, root face stays 3 ~ 4mm, H profile steel or T-steel are located on ship shape moulding bed, gapless assembled by web and flange plate, the web top of T-steel arranges location-plate, ship shape moulding bed base and ground angle are 20 ~ 50 degree, and web is parallel with ship shape moulding bed base;

Step 2, carry out backing welding in the K type groove front of web and flange plate, front backing welding adopts monofilament submerged-arc welding to weld, and welding wire and web angle are 60 ~ 70 degree, and welding current is 550 ~ 650A, weldingvoltage is 29 ~ 31V, and speed of welding is 300 ~ 450mm/min;

Step 3, the K type groove front backing welding of web and flange plate carries out second fill and weld, second is filled weldering and is adopted double wire hidden arc welding welding, and welding current is 640 ~ 680A, voltage 29 ~ 32V, speed of welding 600 ~ 660mm/min;

Step 4, carry out backing welding at the K type groove back side of web and flange plate, back side backing welding adopts double wire hidden arc welding to weld, and welding wire and web angle are 60 ~ 70 degree, and welding current is 650 ~ 800A, weldingvoltage is 30 ~ 35V, and speed of welding is 400 ~ 500mm/min;

Step 5, the K type groove front backing welding of web and flange plate, second fill weld and back side backing welding complete after carry out filling and weld and cosmetic welding, filling weldering and cosmetic welding all adopt double wire hidden arc welding to weld, welding current is 650 ~ 750A, weldingvoltage is 30 ~ 33V, and speed of welding is 600 ~ 700mm/min.